bluuebunny/crossref_metadata_2025 huggingface dataset:
Solvolysis of exo- and endo-Tricyclo[3,3,0,02,8]oct-3-yl p-Nitrobenzoates
Authors: Buckeridge RG , Frayne KJ , Johnson BL
Published: September 2010

exo- and endo-Tricyclo[3,3,0,02.8]octan-3-ols (7a) and (8a) have
been prepared and their structure elucidated. Solvolysis of the derived p-nitrobenzoate of the endo
alcohol in 70% aqueous acetone at 100� occurred some ten times faster than the p-nitrobenzoate
derived from the exo alcohol.
Solvolysis of both p-nitrobenzoates yields a similar range of products which
includes the two olefins (11) and (12), the four alcohols (lc),
(3b), (7a) and (8a), and the p-nitrobenzoate esters of (1c) and (3b). The product
distribution suggest that the intermediate carbonium
ions involved in both solvolysis are verysimilar but quite different
from those involved in the acetolysis of anti-bicyclo[3,2,l]oct-2-en-8-yl
p-toluenesulphonate.
The addition of dithiocarbamic acids to p-benzoquinone
Authors: Harris RLN , Oswald LT
Published: September 2010

Dithiocarbamic acids readily add to p-benzoquinone under carefully controlled conditions to give 2,5-dihydroxyphenyl
dithiocarbamates (5a-f) in good yield. Oxidation of
these esters with bromine in chloroform gives 1,3-benzodithioliminium salts
(6), whereas oxidation with bromine in methanol gives
5-hydroxy-1,3-benzoxathioliminium salts (7). N,N-Disubstituted 1,3-benzodithioliminium salts (6a,b) give stable coloured free bases formulated as zwitterions (8a,b).
Further transformations of these products are described.
Purine studies. XIII. The metabolism of 2,9-Dimethyl-8-methylthiopurine and 2-Carbamoylmethylthio-6,9-dimethylpurine in mice
Authors: Brown DJ , Stephanson LG
Published: September 2010

The metabolism of two purines, which enhance the antibiotic activity of
phleomycin in vitro, has been
followed in mice. 2,9-Dimethyl-8-methylthiopurine (1c) gave mainly
2,9-dimethyl-8-methylthiopurin-6-one (2; R = SMe) and the corresponding sulphoxide (2; R = SOMe). In
contrast, 2-carbamoylmethylthio-6,9-dimethylpurine (1d) gave 2-carbamoylmethylthio-6,9-dimethylpurin-8-one
(5; R1 = SCH2CONH2, R2 = Me)
accompanied in the urine by unchanged material (1d). The identity of each
metabolite was confirmed by unambiguous synthesis.
CNDO/2 study of some polyvalent iodine compounds. I. Negative ions
Authors: Hollingworth RW , Hacobian S
Published: September 2010

A study has been made of
the bonding of some negative polyvalent iodine ions by means of CNDO/2
molecular orbital calculations. The theoretical equilibrium geometries,
harmonic force constants, nuclear quadrupole coupling constants and charge
distributions have been calculated. The results tend to confirm the Pimentel
theory of bonding, whereby iodine achieves its polyvalence through the
delocalization of electrons in the molecular orbital composed of the bonding p-orbitals of
the atoms in the ions.
Viscosity of dimethyl sulphoxide solutions of ammonium bromide, ammonium chloride, potassium thiocyanate and caesium iodide
Authors: Blokhra RL , Parmar ML
Published: September 2010

The relative viscosities
and densities of dimethyl sulphoxide solutions of NH4Br and KCNS at
30�C and of NH4CI, NH4Br and CsI at 25�C are reported.
The relative viscosity coefficient has been calculated, and the A and B
parameters of the Jones-Dole equation have been estimated from the values at
lower concentrations.
Raman spectrum of yellow HgI2 at 20°C
Authors: Cooney RP
Published: September 2010

A method is described for
stabilizing the high temperature (yellow) form of HgI2 at room
temperature.The laser Raman spectrum of
yellow HgI2 at 20�C is reported. A mechanism for the HgI2
phase transition is proposed.
Polyhydroxyanthraquinones from Dothistroma pini
Authors: Danks AV , Hodges R
Published: September 2010

Seven polyhydroxyanthraquinone
derivatives have been isolated from the fungus Dothistroma pini and identified.
Phaseollidin, a Phytoalexin From Phaseolus vulgaris: Isolation, Physicochemical Properties and Antifungal Activity
Authors: Perrin DR , Biggs DR , Cruickshank IAM
Published: September 2010

The isolation of phaseollidin from diffusates of
fungal-inoculated fruits of Phaseolus vulgaris is described. Physicochemical and antifungal
properties of this compound are reported.
Exhaustive C-methylation of ketones by trimethylaluminium
Authors: Meisters A , Mole T
Published: September 2010

Trimethylaluminium in
hydrocarbon solvent at 100-200� gem-dimethylates various ketones (and some aldehydes) to alkanes. gem-Dimethylated alkanes prepared by
this method include 1,l- dimethylindane,
2,2-dicyclopropylpropane, 2,2-di-p-tolylpropane,
1-t-butyl-2,5-dichlorobenzene, 1,l-dimethylcycloheptane, 9,9-dimethyifluorene,
2,3-bis(p-methoxyphenyl)-2-methylpentane,
2,3- bis(p-methoxyphenyl)-2,4-dimethylpentane
and 3,3-dimethylcholestane. Xanthenone and N-methyl-acridone
are gem-dimethylated
particularly easily. Anthrone, however, gives
9-methylanthracene.
The absolute configuration of (+)-3,4-Bis(p-hydroxyphenyl)hexane (hexoestrol) and related compounds
Authors: Collins DJ , Hobbs JJ
Published: September 2010

(+)-(2S,3R)-2,3-Bis(p-methoxyphenyl)valeric
acid, previously converted into (-)-(2R,3R)-2,3-bis(p-methoxyphenyl)pentane, has now been converted into
(+)-(3R,4R)-3,4-bis(p-methoxyphenyl)hexane
via (+)-(3S,4R)-3,4-bis(p-methoxyphenyl)hexan-2-one
and (-)-(4s)-3,4-bis(p-methoxypheny1)hex-2-ene.
This provides unequivocal correlation of the absolute stereochemistry of a
series of homologous diarylalkanes, and a corresponding series of diarylalkenes.
Mossbauer studies in transition metal chemistry. II. Iron(III) methoxides and halomethoxides
Authors: Martin RL , Roos IAG
Published: September 2010

M�ssbauer spectra are reported for a series of insoluble
methoxide and halomethoxide complexes of tervalent iron which are known to exhibit pronounced
antiferromagnetic interactions.1-3 The M�ssbauer
study confirms that all the compounds contain high-spin iron(111) and that the
reduced magnetic moments arise from antiferromagnetically
coupled iron atoms within polymerized species. The quadrupole splittings which are due solely to lattice effects and
anisotropic bonding are consistent with some of the previously proposed
structures but definitely exclude others. It is concluded that the M�ssbauer data are better rationalized in terms of a
three-dimensional layer structure in which the ratio of halogen to methoxide is
progressively varied in a FeX3 lattice.
Spin-spin coupling in copper(II) complexes of Pentane-2,4-dione
Authors: Barraclough CG , Brookes RW , Martin RL
Published: September 2010

A number of complexes in
the series Cu(acac)(X), where X = OMe-,
OEt-, OCH2Ph-, N3- and
pz- (the pyrazolate anion), have been
prepared and their magnetic properties determined down to liquid nitrogen
temperatures. Also reported is the complex Cu2(acac)2(OH)(pz).
In each case, the magnetism is interpreted in terms of spin coupling within a
binuclear unit. All coupling is antiferromagnetic in nature, except for X = N3-
which appears to be weakly ferromagnetic.
The enthalpies of solution of Hexa-1-ol and Heptan-1-ol in water
Authors: Hill DJT , White LR
Published: September 2010

The solubility of hexan-1-ol
and heptan-1-ol in water has been measured over the temperature range 278-308
K. The free energy, enthalpy and heat capacity of solution of these alcohols
has been calculated from this data and the enthalpy and heat capacity have also
been obtained by direct calorimetric measurement. The thermodynamic function
changes on solution of these two alcohols follow the pattern of the lower
members of the homologous series. The results have been compared qualitatively
with data for the other alcohols and for the hydrocarbons.
Preparation and thermolysis of exo-and endo-Tricyclo[6,2,1,02,7] undeca-3,5,9-triene
Authors: Rye AR , Wege D
Published: September 2010

Syntheses of exo- and endo-tricyclo[6,2,1,02,7]undeca-3,5,9-triene, (3) and
(4) respectively, are described. Both trienes
undergo ready π4s+ π28 cycloreversion to yield cyclopentadiene and benzene at
40-60�C, the exo-triene
(3) being slightly more reactive. At 60�C, for (3) k = 2.29x 10-3 s-1,
ΔH? = 104.1 � 4.2kJ mol-1, ΔS? =14.6 � 1.6 mol-1 K-1,
while for (4) k = 5.25 x 10-3s-1, ΔH? =ll5.0 � 3.3
kJ mol-1, ΔS? = 34.3 � 13.0 J mol-1 K-1 .� The cycloreversion
of (3) and (4) are believed to be concerted reactions. The related dienes exo- and endo-tricyclo[6,2,1,02,7]undeca-3,5-diene,
(25) and (28) respectively, have also been prepared, and are stable up to 200�C.
At 300�C, interconversion between (25) and (28)
occurs, apparently via bicyclo[6,2,1]undeca-2,4,6-triene. The relationship of
the trienes (3) and (4) to the recently described
bicyclo[6,2,l]undeca-2,4,6,9-tetraene is discussed.
Occurrence of ( - )-Car-3-en-2-one in Zieria aspalathoides (Rutaceae)
Authors: Lassak EV , Southwell IA
Published: September 2010

The steam-volatile leaf oil
of Zieria aspalathoides
A. Cunn, ex Benth. contains (-)-car-3-en-2-one as its
major component. Minor amounts of α-phellandrene,
car-3-ene, terpinolene, limonene, 1,8-cineole, myrtenol, β-trans-ocimene, α-thujone and caryophyllene were tentatively identified by g.1.c.
co-chromatography.
Cyclometallation reactionds. VIII. Binuclear manganese carbonyl complexes derived from azobenzene
Authors: Bennett RL , Bruce MI , Goodall BL , Stone FGA
Published: September 2010

The binuclear
bis-ortho-metallated complex( O C ) ~ M ~ C ~ H ~ N = N
C ~ H ~ M ~ ( C O ) ~ - Ihas been obtained from a
reaction between MnMe(CO)5 and Mn(C6H4N=NPh)(C0)4; the reactionbetween azobenzene and
MnPh(CO)$ affords (PhN-NHC,H4)Mn2(C0)6.
The E.S.R. spectra of some 2,6-dialkoxyaryloxy radicals
Authors: Campbell EM , Hewgill FR
Published: September 2010

E.s.r, spectra of aryloxy
radicals derived from 4-t-butyl-2,6-dimethoxyphenol and
4-t-butyl-2,6-diethoxyphenol and also from the corresponding
3,5-dideuterophenols have been analysed. In bothcases aH meta = aH α-alkoxy.
Kinetics, stoichiometry and mechanism in the bromination of aromatic heterocycles. II. Aqueous bromination of imidazole, 1-methylimidazole and 2-methylimidazole
Authors: Boulton BE , Coller BAW
Published: September 2010

The coulo-chrono-potentiometric
method has been used to obtain rate constants for reaction of molecular bromine
with neutral imidazoles (aq.,
298 K). Values of 10-6kbl/dm3 mol-1
s-l were:

Substrate 5-position
4-position 2-position Imidazole 0.5 0.4 0.2
1-Methylimidazole 2.3 1.7
0.8 2-Methylimidazole 90 -
-

The network of reactions
leading to 2,4,5-tribromo-1-methylimidazole is described in detail. Relative
rates of successive brominations are pH sensitive and
conditions may be designed to obtain optimum yields of partially brominated imidazoles.
Kinetics, stoichiometry and mechanism in the bromination of aromatic heterocycles. IV. Aqueous bromination of Imidazo[1,2-a]pyridine
Authors: Boulton BE , Coller BAW
Published: September 2010

The reaction of imidazo[l,2-a]pyridine with bromine has been studied in
dilute acidic aqueous solution at 25�C. The bimolecular rate coefficient for
attack by Br2 on the molecular substrate at the 3-position is found
to be

K�bi = 1.30(� 0.05) x 109 dm3 mol-l s-l

We find pK.(imidazo[l,2-a]pyridine-H+, aq.,
25�C) = 6.65 and pK,(3-bromoimidazo[l,2-alpyridine-H+,
aq.,25�C) = 4.95. The latter compound reacts
with bromine in aqueous acetate buffer at pH4.
Methyleneketenes and methylenecarbenes. III. Pyrolytic synthesis of arylacetylenes and their thermal rearrangements involving arylrnethylenecarbenes
Authors: Brown RFC , Eastwood FW , Harrington KJ , McMullen GL
Published: September 2010

Flash vacuum pyrolysis
(550-600�) of 5-benzylidene derivatives of 2,2- dimethyl-1,3-dioxan-4,6-dione(isopropylidene
malonate) gives phenylacetylenes bearing m- or p-substituents (H, Me, MeO, Cl, CN)in 64-98% yield.
o-Methoxy- and o-phenyl-benzylidene derivatives give the arylacetylenes even at
420�. Arylacetylenes equilibrate with arylmethylenecarbenes,
ArCH=C:, at 550-720�, as shown by labelling
experiments using 13C and by the formation of products of
interaction with o-substituents. Methylenebenzocyclobutene
and o-tolylacetylene each form indene at 700-720�.
The reaction between cobalt(II) ions and Pyridine-2-carbaldehyde oxime in aqueous solution
Authors: Grant MW , Magee RJ
Published: September 2010

Pyridine-2-carbaldehyde
oxime reacts with cobaltous ion in aqueous solution according to the equation :����������������������� Co2+ + 3LH+1/2O2
→ CoL3 + 2H+ + 1/2H2O2

In the absence of oxygen
the ligand can function as oxidant. The rate of formation of the cobalt(III)product
appears to involve the rate- determining dimerization of the deprotonated
cobalt(II) complex, CoL+. Oxygen has no
effect on the rate of reaction.
Cyclic voltammetric studies. II. Substituted anilines in acetonitrile
Authors: Mohammad M , Khan AY , Afzal M , Nisa A , Ahmed R
Published: September 2010

Results of single sweep
triangular wave cyclic voltammetric studies on some substituted anilines in
acetonitrile are reported. It has been found that, while the first reduction
steps of nitroanilines are reversible that of chloroaniline is irreversible. The
second reduction steps were found to be irreversible and the overall picture
emerged of a multistep process involving reversible
charge-transfer steps followed by an irreversible chemical reaction.
The occurrence of Ergosta-4,6,8(14),22-tetraen-3-one in several fungi
Authors: Price MJ , Worth GK
Published: September 2010

Ergosta-4,6,8(14),22-tetraen-3-one
has been identified in extracts of rice infected with Aspergillus,
Penicillium and Fusarium
species.
Voltammetric investigation of the kinetics of alkali metal cation reduction in N,N-dimethylformamide
Authors: Diggle JW , Parker AJ , Owensby DA
Published: September 2010

The standard
electron-transfer heterogeneous rate constant of lithium, potassium, sodium and
caesium amalgams in N,N-dimethylformamide was ascertained employing cyclic
voltammetry in an effort to relate the presence of a non-equilibrium electrode
reaction at the dropping lithium amalgam electrode to the variation of the
lithium amalgam electrode potential with amalgam electrode con- figuration,
i.e. whether streaming, dropping or stationary. Such variations are not
observed at other alkali metal amalgam electrodes. ��� In the dipolar aprotic solvents the
standard electron-transfer heterogeneous rate constant for the Li(Hg) electrode
increases as the solvating power for Li+ decreases, i.e. dimethyl
sulphoxide < di- methylformamide < propylene
carbonate. Water is a much stronger solvator of Li+ than is
propylene carbonate, but the electron transfer is faster in water than in
propylene carbonate; the important role of entropic contributions in ion
solvation is discussed as an explanation.
Copper(II) complexes of the bidentate Schiff-base ligand 2-(Phenyliminomethyl)pyridine and some related ligands
Authors: Halbert EJ
Published: September 2010

A number of copper(II)
complexes of anils of pyridine-2-carbaldehyde with chloride, bromide, nitrate
and perchlorate as anions have been prepared. Spectral and conductivity studies
suggest that the compounds may be compared with the complexes of ligands such
as bipyridyl and Schiff bases derived from pyridine-2-carbaldehyde and
aliphatic diamines. Physicochemical evidence is given for the stereochemistry
of the compounds. Mono-, bis- and tris-chelated compounds have been obtained.
Complexes of the type CuLX2 (where X = Cl
and Br) appear to be polymers with a five- or six-coordinate copper(II)
stereochemistry. Evidence is presented for the existence of the five-coordinate
cation [CuL2X]+ (where X = Br and NO3) in the
solid compounds of type CuL2X2. In solution in
nitromethane and methanol interaction occurs with the solvent. The bis- and
tris- perchlorato compounds CuL2(ClO4)2 and
CuL3(ClO4)2,2H2O are described and
possible structures suggested by comparison with analogous compounds.
E.S.R. studies of the oxidative coupling of some bisphenols
Authors: Colegate SM , Hewgill FR , Howie GB
Published: September 2010

E.s.r. spectroscopy and the
identification of products show that oxidation of 3,5,3?,5?-tetra-t-butyl-4,4?-dihydroxybenzophenone
in neutral solution gives 3,5,3?,5?-tetra-t-butyldipheno-4,4?-quinone. If
oxygen is present 2,6-di-t-butyl-p-benzoquinone is also formed. The evolution
of carbon monoxide suggests that bis-spirodienones
are intermediate in the formation of these products. E.s.r. spectra of radicals
produced by oxidation of 3,5,3?,5?-tetra-t-butylbiphenyl-4,4?- dio and 2,6-di-t-butylhydro-quinone have been re-examined.
In alkaline solution 3,5,3?,5?-tetra-t-butyl-4,4?-dihydroxybenzo-phenone is
oxidized to a radical anion in which the unpaired electron is delocalized over
both rings. ��� Attempts to detect unsymmetrical bisaryloxy
radicals were unsuccessful, 3?,5?-di-t-butyl-4,4?-dihydroxy-3,5-dimethoxybenzophenone
forming only the radical derived from the syringoyl portion, and 2,4?- oxydiphenol
ether forming only the 4?-oxy radical. Comparison with the observation of both
radicals when a mixture of guaiacol and p- methoxyphenol was oxidized suggests
that C-O-C coupling in 2,4?- oxydiphenol proceeds by direct radical pairing.
Pyrazolidine-3,5-diones with heterocyclic substituents. III. Oxidation of 4-Monoalkylpyrazolidine-3,5-diones
Authors: Woodruff M , Polya JB
Published: September 2010

4-Alkylpyrazolidine-3,s-diones
with phenyl or 3-phenyl-1H-1,2,4- triazol-5-yl substituents on N 1 or N 2 were
oxidized with oxygen or hydrogen peroxide in acidic, basic or neutral media.
Conditions under which 4-hydroxypyrazolidinediones and monohydrazides of
malonic or tartronic acids are formed were noted.
Interaction of dicyandiamides with thioureas : formation of Hexahydro-4,6-diimino-1-aryl-1,3,5-triazine-2-thiones and amidinothioureas
Authors: Joshua CP , Rajan VP
Published: September 2010

Dicyandiamide and
aryldicyandiamides react with thiourea and N- arylthioureas in the presence of concentrated
hydrochloric acid to yield hexahydro-4,6-diimino-1-aryl-1,3,5-triazine-2-thiones
and amidino/arylamidinothioureas. Condensation of amidinothiourea with
arylcyanamides is also found to produce the same 1,3,5-triazine derivatives.
The mechanism of formation of these products is briefly discussed.
The structures of the methanol and hexanol adducts of Tris(quinolin-8-olato)manganese(III)
Authors: Hems R , Cardwell TJ , Mackay MF
Published: September 2010

X-ray analyses of
monoclinic crystals of the methanol and hexanol adducts of tris(8-quinolinolato)-manganese(III)
respectively have established their structure. The crystals are isomorphic and
belong to the space group P21/n with Z = 4. The cell parameters are
a = 10.847, b = 13.201, c = 17.285 Ǻ,β = 97.56� (methanol) and a =
11.201, b = 13.342, c = 17.200 Ǻ, β = 97.09� (hexanol). The methanol
structure contains one alcohol molecule per asymmetric unit whereas in the
hexanol structure there is only half an alcohol molecule. The hexanol is
therefore disordered, with the centre of the central C-C bond lying at the
crystallographic centre of symmetry. The configuration of the tris-chelate is
meridional.
The basic methanolysis of some substituted 4'-nitrobenzanilides
Authors: Broxton TJ , Carolane CJ , Deady LW
Published: September 2010

Rate constants for the
basic methanolysis of ArCONHC6H4NO2-p in
methanol at 333 K are reported. When allowance is made for substrate
ionization, a linear Hammett plot (p 1.88) is obtained. The very low
substituent effect on rate observed previously for this reaction in acetone- methanol
is shown to be due to omission of any correction factor for extensive
ionization.
Metal complexes of 1,10-phenanthroline derivatives. X. 5T2 ↔ 1A1 transitions in iron(II) complexes of 2-(1,10-Phenanthrolin-2-yl)imidazole derivatives
Authors: Mather DW , Goodwin HA
Published: September 2010

The preparation of the tridentate
chelating agents 2-(1,10- phenanthrolin-2-yl)imidazoline and
2-(1,10-phenanthrolin-2- yl)benzimidazole and their
bis-ligand complexes with iron(II) and nickel(II) is described. The latter
ligand coordinates as either a neutral or anionic tridentate. Data from the
spectra of the nickel(II) complexes indicate that the ligands have field
strengths in the iron(II) crossover region. The temperature dependence of the
magnetism of the imidazoline iron(II) complex reveals a gradual, temperature- induced
5T2 ↔ 1A1 transition which is
not complete within the experimental temperature range (83-363 K). Both the
cationic and neutral iron(II) complexes of the benzimidazole derivative are
essentially low-spin at room temperature but a significant increase in their
magnetic moments at elevated temperatures indicates that a spin transition may
be occurring in these compounds too.
The reaction of malononitrile with some β-dicarbonyl compounds
Authors: Ducker JW , Gunter MJ
Published: September 2010

The reaction of β-keto
esters and amides with malononitrile, in the presence of alcohol, has been shown
to proceed through cyanocarbon acid and iminopyran intermediates to yield the
pyridones (3).With β- diketones, in benzene solution, a similar reaction is
accompanied by the formation of δ-lactams(15) and benzene derivatives
(16).
Studies on Benzo[b]thiophen derivatives. Synthesis and reactions of 2-p-substituted Benzoylbenzo[b]thiophen-3(2H)ones
Authors: Awad SB , Abdul-Malik NF
Published: September 2010

2-p-Substituted
benzoylbenzo[b]thiophen-3(2H)-ones were synthesized by cyclization of the
corresponding p-substituted 2-(phenacylthio)benzoic acids with different
reagents. The behaviour of these diketones toward the action of
phenylhydrazine, arylmagnesium bromide and sodium borohydride was investigated.
They gave the corresponding monophenylhydrazone derivatives which cyclized to
give 1-phenyl-3-aryl- 1H-[1]benzothieno[3,2-c]pyrazoles;
2-bisarylmethylenebenzo[b]-thiophen- 3(2H)-ones; and 2-arylmethylenebenzo[b]thiophen-3(2H)-ones
respectively. The structure of the above reaction products was confirmed by
synthesis through other routes.
The pyrolysis of pinanes. X. Pyrolysis of some endo-Pinen-7-ols
Authors: Cant PAE , Coxon JM , Hartshorn MP
Published: September 2010

The gas phase pyrolysis of
endo-pin-2-en-7-ol, endo-10β-pinan-7-ol and
7-exo-methyl-endo-pin-2-en-7-ol are described.
Activity coefficients of potassium perrhenate in aqueous mixtures with KCl, NaCl and KI at 298.15 K
Authors: Chan C
Published: September 2010

The solubilities of
potassium perrhenate in aqueous NaCl, KCl and KI solutions are reported. The solubility activity
product for this electrolyte was determined using extrapolation functions
involving three different mean ionic activity coefficient expressions. Mean
ionic activity coefficients have been computed for potassium perrhenate in
dilute aqueous solutions and there is no justification for considering ion
association1,2 in these solutions.
The synthesis of Cyclododecane-r-1,c-5,c-9-triamine and r-1,c-5,c-9-Tris(2,3-dimethoxybenzamido)cyclododecane
Authors: Collins DJ , Lewis C , Swan JM
Published: September 2010

Treatment of
cyclododecane-r-1,c-5,c-9-triyl tris(p-toluenesulphonate) with sodium azide in
dimethyl-formamide at 100� for 6 h gave the corresponding cis,cis-triazide
which upon hydrogenation or reduction with lithium aluminium hydride gave
cyclododecane-r-1,c-5,c-9-triamine, isolated as the tris-salicylidene
derivative. Acid hydrolysis of this, removal of the salicylaldehyde, and
treatment of the aqueous solution with sodium carbonate and
2,3-dimethoxybenzoyl chloride gave r-1,c-5,c- 9-tris(2,3-dimethoxybenzamido)cyclododecane.
��� Treatment of
(E,E,E)-cyclododeca-1,5,9-triene with an excess of acetonitrile and sulphuric
acid at room temperature for three days gave 18% of
(E,E)-1-acetamidocyclododeca-4,8-diene; no di- or
tri-amides were isolated.
The standard potential of the silver-silver bromide electrode and ion solvation in t-butyl alcohol + water mixtures at 298.15 K
Authors: Khoo KH , Chan C
Published: September 2010

E.m.f. measurements of the
cell

���������������������� Pt|H2|HBr(m),
ButOH(X), water|AgBr|Ag

have been made at 298.15 K
for solvent compositions X = 10, 20, 30, 40, 50 and 70% (w/w) of t-butyl
alcohol. These have been used to evaluate the standard potential of the
silver-silver bromide electrode and the free energy of transfer, ΔG�t,
of the acid from water to the respective solvent media. These ΔG�t
values, along with those for hydrochloric acid, are briefly discussed in
relation to ion solvation. ��� Mean ionic activity coefficients of
hydrobromic acid in the various solvents have also been calculated.
Studies on the application of the quinhydrone electrode in formamide. IV. The ionization constants and related thermodynamic quantities of picric acid from E.M.F. measurements at different temperatures
Authors: Dash UN , Nayak B
Published: September 2010

The e.m.f, of the cell

���������������� Ag-AgCl/KCl(m3),
KPic(m2), HPic(m1),
QH2-Q|Au

in formamide has been
measured at 5� intervals over the temperature range 5-45�C. The pKa
value of picric acid ranges from 2.19 � 0.12 at 5� to 1.16 � 0.08 at 45�.
Nickel-catalysed conjugate addition of trimethylaluminium to α,β-unsaturated ketones
Authors: Bagnell L , Jeffery EA , Meisters A , Mole T
Published: September 2010

Nickel acetylacetonate
brings about the conjugate addition of trimethylaluminium to α,β-unsaturated
ketones. The yields of β- methylated ketones range from 30% to
quantitative. At the same time, catalysis of 1,2-addition of trimethylaluminium
to the α,β-unsaturated ketones also occurs (leading to allylic
alcohols). The conjugate addition has been applied to 1,3-diphenylprop-2-en-1-one,
cyclohex-2- en-1-one, 3-methylcyclohex-2-en-1-one, 1-acetylcyclohexene,
pulegone, α-ionone, β-ionone and isophorone. ��� Iron(II), iron(III) and cobalt(III)
acetylacetonates as catalysts for the conjugate addition give more varied
products. Those from isophorone are most noteworthy.
Nickel-catalysed conjugate addition of trimethylaluminium to cyclopropyl ketones
Authors: Bagnell L , Meisters A , Mole T
Published: September 2010

Nickel-catalysed addition
of trimethylaluminium to cyclopropyl ketones (RCOC3H5)
affords 1-substituted pentan-1-ones (RCOC4H9; R = C6H4,
4- ClC6H4, 4-MeOC6H4, 3,4-Me2C6H3,
c. 50% yield; R = 4-BrC6H4, 10%; and R = cyclopropyl,
30%).
Cross-linking of amino acids by formaldehyde. 13C N.M.R. spectra of model compounds
Authors: Dewar MK , Johns RB , Kelly DP , Yates JF
Published: September 2010

The use of 13C
N.M.R. for the identification of the site of cross- linking of amino acids by
formaldehyde has been evaluated by use of model compounds, such as 2,4-dimethylphenol
for tyrosine. The 13C chemical shifts of the formaldehyde-derived
methylene carbons occur within the range 50-60 p.p.m.
downfield from Me4Si. Estimated shifts in lysine-lysine and
tyrosine-glutamine cross-linked systems fall just outside this region. The 13C
spectra of a number of related phenols, amines and protected amino acids are
also reported.
Single-centre molecular orbital calculations on third row hydrides - SeH2 and HBr
Authors: Maclagan RGAR
Published: September 2010

Single-centre molecular
orbital calculations are reported for SeH2, and HBr using basis sets
extending up to 5d orbitals centred on the heavy atoms. The choice of orbitals
to be used in extending the basis set and the optimum values for orbital
exponents are discussed. Orbital energies comparable with minimal basis set
multicentre calculations are obtained for SeH2. The orbital energies
are compared with those obtained experimentally by photoelectron spectroscopy.
The results suggest that the single-centre method is worthy of consideration
when studying the hydrides of the heavier elements.
Concerning band analysis in crystalline nitrates
Authors: James DW , Carrick MT , Shurvell HF
Published: September 2010

The origin of the low
frequency asymmetry on the symmetrical stretching mode of the nitrate ion in
crystalline nitrates of sodium, silver and caesium has been studied. The
asymmetry has been shown to arise from a combination of correlation field
splitting and the presence of ?hot? bands. Some factors influencing the
position and intensity of the ?hot? bands are considered.
On the chemical consequences of long-range interactions in chiral systems
Authors: Schipper PE
Published: September 2010

The chemical manifestations
of discrimination in long-range (non- contact) interactions of chiral molecules
are analysed in three stages. A simple thermodynamic model is used to establish
a method of presenting experimental data (such as differences in racemization
rates, solubilities and redox potentials of pure enantiomers in non- associating
chiral media) in terms of well defined thermodynamic discriminations. The
thermodynamic quantities are then related directly to discriminations in
intermolecular interactions through a statistical thermodynamic treatment. Estimates
of the discrimination in intermolecular forces from experimental thermodynamic
data suggest that only electrostatic interactions are sufficiently large to
account for the experimentally observed values of the discrimination.
Structure of aqueous solutions: Infrared spectra of the water librational mode in solutions of monovalent halides
Authors: James DW , Armishaw RF
Published: September 2010

The variations of the
infrared librational mode of water with concentration of added salt have been examined
at 30�C for solutions of NH4F, NH4Cl, NH4Br,
NH4I, LiCl, LiBr, NaCl, NaBr, NaI, KCl, KBr and KI. The data
indicate that water in the primary hydration sheath can be distinguished from
the remainder of the water and primary hydration numbers have been estimated.
It is shown that in general the larger the ion the greater the change to the
spectral band. The ammonium fluoride is shown to be unique in producing little
disturbance of the water structure.
The crystal and molecular structure of 4-Bromo-1,1,3,3,5,7,7,9,9-nonamethylbicyclo[4,4,0]pentaborophane
Authors: Clark GR , Palenik GJ
Published: September 2010

Crystals of
4-bromo-1,1,3,3,5,7,7,9,9- nonamethylbicyclo[4,4,0]pentaborophane, C9H35B5P5Br,
are monoclinic, with a = 9.502(3), b = 20.185(15), c = 13.604(4) Ǻ, β
= 116.49(2)�. The space group is P21/c, with four molecules in the
cell. Intensity data were collected by means of an automated diffractometer.
The atomic positions have been determined by least-squares refinement of 2859
observed reflections. The final residual, R, is 0.077. The molecule contains a
framework of alternat- ing
boron and phosphorus atoms constituting a decalin-like ring system. The two
cis-fused cyclo- hexane type rings are both in the chair conformation. The
bromine atom is equatorially bonded to the boron atom in the 4-position. The
Br-B bond length is 2.039(10) Ǻ. The average P-B and P-C distances are
1.943 and 1.828 Ǻ respectively. Average internal ring angles are 112.2�
for P-B-P, and 113.6� for B-P-B. This geometry indicates only very slight
charge delocalization in the cyclic system.
An electron spin resonance study of (N-2-Pyridylsalicylaldiminato)copper(II) nitrate
Authors: Smith TD , Cookson DJ , Pilbrow JR , Beckett R
Published: September 2010

The magnetic susceptibility
of (N-2-pyridylsalicylaldiminato)copper(II) nitrate and chloride has been
measured at room temperature and 97 K. Contrary to results reported previously
we find no evidence for the presence of magnetic exchange interactions in these
compounds. Electron spin resonance spectral data on the
ethanol-dimethylformamide solutions of the chelates show that the chelates are
monomeric in the liquid phase but largely in dimeric form in frozen solution.
Computer simulation of the experimental e.s.r. spectra due to the dimeric form
has enabled a determination of the symmetry arrangement and structural
properties of the pair system to be made.
Reaction of dinitrogen oxide with Pentaammineaquaruthenium(II) and isolation of Pentaammine(dinitrogen oxide)ruthenium(II) complexes
Authors: Diamantis AA , Sparrow GJ , Snow MR , Norman TR
Published: September 2010

The reaction between
dinitrogen oxide and Ru(NH3)5OH22+
to form the dinitrogen complexes of pentaammineruthenium(II)
was investigated. At high pressures of N2O the Br, I, BF4
and PF6 salts of Ru(NH3)5N2O2+
were isolated. The compounds were characterized and their aqueous chemistry compared
with that of the corresponding salts of Ru(NH3)OH22+
whose preparation and characterization are also reported here. The infrared
spectra and X-ray powder patterns of the dinitrogen oxide complexes are
reported.
Viscometric studies on the aqueous suspensions of clay-protein complexes
Authors: Srivastava SK , Chauhan OS
Published: September 2010

The viscosity variations of
aqueous suspensions of certain homoionic forms of bentonite were measured
following adsorption of different kinds and quantities of proteins. Dissymmetry
and interaction of the clay-organic complexes were then calculated from the
Schulz-Blaschke equation. A positive and almost
linear relation was observed between the dissymmetry of H- and Al-bentonite and
the amount of protein adsorbed. H-bentonite displayed greater dissymmetry and
it is inferred that edge-to-edge and edge-to-face linkage of clay particles
takes place. Maximum dissymmetry of H-bentonite-protein complexes was found at
isoelectric pH of the proteins. Mg-bentonite however behaves differently.
Competitive reduction of aldehyde-ketone mixtures by complex hydroborates and hydroaluminates
Authors: Sell CS
Published: September 2010

Lithium tri-t-butoxyhydroaluminate, sodium tetrahydroborate and lithium
tetrahydroborate, in stoichiometric amounts, reduce benzaldehyde in the
presence of acetophenone or butanal in the presence of butanone. Lithium tetrahydroaluminate and lithium cyanatohydroborate are less
selective.
The mass spectra of some ortho-phenylene substituted trivalent organo-arsines and -phosphines
Authors: Henrick K , Mickiewicz M , Wild SB
Published: September 2010

An investigation of the
mass spectra of a series of trivalent organoarsines and some of their
phosphorus analogues of the general types, o-X-C6H4AsRR?
[where X = CH3, CH2OCH3, CH2CH2OCH3,
Br, Cl, CO2H or CO2CH2CH3 and RR? =
(CH3)2, Cl2 or CH3(C6H5)]
and o-X-C6H4CH2AsRR? [where X = Br or Cl and
RR? = (CH3)2, Cl2, CH3(C6H5),
(C6H5)2 or (p-CH3C6H4)2],
has been carried out at 70 eV. The main fragmentation pathways have been
determined and it has been shown that the ortho substituents direct the
breakdown of the molecular ions to the formation of five-membered
arsenic-containing ring systems. The general ortho coupling effect found in the
substituted aromatic arsenic compounds discussed here is more pronounced than
that observed in the spectra of symmetrical o- phenylenediarsines and related
compounds of phosphorus and antimony.
Infrared solvent shift studies. I. Acetylacetonates of some trivalent transition metals
Authors: Chau JYH , Hanprasopwattana P
Published: September 2010

Solvent shift studies of MIII
acetylacetonates where M = Co, Cr, Fe and Mn are
reported in the 1700-1250 cm-1 region in about 20 solvents.
Definitive assignments are made on fundamental C=O and C=C=C stretching
vibrations. New solid bands are reported; these are probably due to combination
bands, overtones, and ligand-crystal field effects. The possibility of Jahn-Teller effects, Fermi resonance, and the degree of
π-electron delocalization in the chelate rings are discussed.
A comparison of homogeneous and heterogeneous platinum as catalysts for the deuteration of condensed polycyclic aromatic hydrocarbons
Authors: Davis KP , Garnett JL
Published: September 2010

A comparison has been made
of homogeneous sodium chloroplatinate(II) with heterogeneous platinum metal as catalysts
for the exchange in D2O of naphthalene, anthracene and pyrene, three
representative condensed polycyclic aromatic hydrocarbons. For this purpose,
very careful detailed experiments have been designed so that the progressive
deuteration of the aromatics could be followed with time especially in both
catalytic systems. Initial isotope orientation is similar for both catalysts
although specificity is better with homogeneous platinum. Naphthalene during
the initial stages of exchange yields ,&orientation with an M value of 1,
ultimately giving naphthalene[β-D4]. Only with heterogeneous
platinum does prolonged exchange yield naphthalene[D8]. A unique
scrambling reaction of naphthalene[β-D4] has been observed only
with heterogeneous platinum. The reactivities of anthracene and pyrene are
similar to naphthalene. Present data have been interpreted in terms of bond
localization concepts, in particular the role of π-olefin type complexes
in both catalytic systems. The results also indicate that π- dissociative,
as compared with π-associative, mechanisms predominate both homogeneously
and heterogeneously.
Rates of N-methylation of N-arylpyrazoles
Authors: Deady LW , McLoughlin RG , Grimmett MR
Published: September 2010

The rates of quaternization of the title compounds with dimethyl
sulphate in sulpholane are reported and compared with results for N- arylimidazoles.
A greater effect of substituents on rate is observed for the pyrazoles and
evidence for the occurrence of steric effects is presented.
The radical stabilization energy due to an a-chlorine atom from the kinetics of the thermal isomerization of 1-Chlorobicyclo[2,2,0]hexane in the gas and liquid phase
Authors: Solly RK , Cain EN
Published: September 2010

The rate of isomerization
of 1-chlorobicyclo[2,2,0]hexane to 2- chlorohexa-1,5-diene, both in the gas
phage and in solution, has been measured over the temperature range 409-497 K.
The Arrhenius parameters derived from these rates are represented by the equations

����������������������������� log(kg/s-1)=(13.49�0.08)-(148.2�0.6/θ

����������������������������� log(ka/s-1)=(13.21�0.12)-(144.44�0.50)/θ� and�����������������������������
log(kb/s-1)=(13.25�0.44)-(144.8�1.6)/θ

where the subscripts g, a
and b refer to the gas phase, tetrachloroethylene as
solvent and o-dichloro-benzene as solvent respectively, θ = 19.15 kJ mol-1
and the errors are least-squares deviations. A radical stabilization energy of
5�2 kJ mol-1 for the α- chlorine atom derived from these
Arrhenius parameters is in excellent agreement with the value derived from
kinetics of the isomerization of 1,4-dichlorobicyclo[2,2,0]hexane and from the
thermochemistry of chloroethyl radicals.
Some extractives from the leaves of Bosistoa sapindiformis (Rutaceae)
Authors: Croft JA , Ritchie E , Taylor WC
Published: September 2010

From the leaves of Bosistoa sapindiformis F. Muell. (Rutaceae) small amounts
of taraxerol, sawamilletin
and β-sitosterol were isolated.
The apparent molar volumes of aqueous ammonia, ammonium chloride, aniline and anilinium chloride at 25°C and the volume changes on ionization
Authors: Stokes RH
Published: September 2010

The apparent molar volumes
of aqueous ammonia, ammonium chloride, aniline and anilinium chloride are
measured up to 2 mol l-1 at 25�C by a combination of pyknometric and
dilatometric methods. The apparent molar volume
f�V of undissociated ammonia at infinite
dilution is found to be 24.85�0.02 cm3 mol-1, and that of
NH4Cl is 35.71�0.02 cm3 mol-1. The volume
change on ionization for the standard states ΔV� is -29.07�0.04 cm3
mol-1. For aniline the values are: f�V(PhNH2) 89.30, f�V(PhNH3Cl) 102.74
and ΔV� -26.49�0.05 cm3 mol-1.
Crystal and molecular structure of (RS,RS)-Tetraammine(4,5-dihydroxy-4,5-dimethyl-1-pyrroline-2-carboxylato)cobalt(III) perchlorate
Authors: Robertson GB , Whimp PO
Published: September 2010

The structure of a
cobalt(III) tetraammine complex of 4,5-dihydroxy- 4,5-dimethyl-1-pyrroline-2-carboxylic
acid (abbreviated as hmpc), (RS,RS)-[Co(NH3)4(hmpc)] (ClO4)2,H2O, has
been determined from three- dimensional X-ray data collected by counter methods.
Crystals are monoclinic, space group P21/c, with a 11.984(5), b
8.836(4), c 19.609(7) Ǻ, β 110.58(2)�, Z 4. The structure has been
refined to weighted and unweighted R-factors of 0.068 and 0.063, respectively,
for the 1616 independent reflections with I/σ(I) ≥ 3.0. Hydrogen
atoms could not be located and have not been included in the scattering model.
There is considerable steric strain within the substituted pyrroline ligand,
and the C=N distance is 1.293(8) Ǻ. Surprisingly, the methyl groups in the
4- and 5-positions are in a cisoid configuration (the
torsion angle for the methyl groups about the 4-5 bond is 39.5�), and
consequently the hydroxyl oxygen atoms are close [O-O distance, 2.583(8) Ǻ];
this suggests that there may be a bridging hydrogen atom.
Electron impact studies. XCVIII. Negative ion mass spectra of the carbonyl group. The Aryl-CO- and Aryl-COCO- systems
Authors: Bowie JH , Janposri S
Published: September 2010

Collision-induced
decompositions of molecular anions of the general formula aryl-CO-alkyl yield
aryl- ions. The aryl-CO-aryl group is stable under these conditions.
Parent anions from α-dicarbonyl systems do not generally fragment but, in
the case of o-nitrobenzil, fragment anions are
produced after cyclization of the nitro group at both carbonyl centres.
Substituted endo-Tricyclo[3,2,1,02,4]oct-6-enes. I. Preparation by the Diels-Alder reaction between cyclopropene and substituted cyclopentadienes
Authors: Kagi RI , Johnson BL
Published: September 2010

The Diels-Alder reaction
between cyclopropene and substituted cyclopentadienes has been used to prepare
several chloro- and chloromethoxy-substituted endo-tricyclo[3,2,1,02,4]oct-6-enes.
In the presence of base, the reaction of 1,2,3,4-tetrachlorocyclopentadiene
with cyclopropene yielded the expected adduct together with adducts arising
from the isomeric 1,2,3,5- and 1,2,4,5-tetrachlorocyclo- pentadienes.
Subsequent isomerization during workup of the adduct,
1,6,7,anti-8-tetrachloro-endo-tricyclo[3,2,1,02,4]oct-6-ene,
afforded endo-4,6,7,8-tetrachlorotricyclo[3,3,0,02,8]oct-6-ene. The
relatively unreactive methoxy-substituted cyclopentadienes yielded adducts of
cyclopropene together with adducts of 3-cyclopropylcyclopropene (cyclopropene
dimer). Structural assignments of adducts were based predominantly on p.m.r. data which will be discussed in greater detail in a later
publication.
New oxidation products of tryptophan
Authors: Savige WE
Published: September 2010

Oxidation of L- or
DL-tryptophan by one molar equivalent of peroxyacetic acid in water at 0-5�
gives principally a mixture of 3a- hydroxy-1,2,3,3a,8,8a-hexahydropyrrolo[2,3-b]indole-2-carboxylic
acid (A) diastereoisomers, while oxidation by two or three equivalents of
oxidant gives mainly N?-formylkynurenine (C11H12N2O4)
and a diastereoisomeric product (B), C11H12N2O5,
tentatively assigned the structure 2-amino-3-(4-hydroxy-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-4-
yl)propionic acid. ��� Oxidation of (A) by peroxyacetic acid also
gives formylkynurenine and (B). Rearrangement of (A)
to oxindolylalanine occurs in 12N HCl
at 20� or 2N HCl at 80�. (A) is also obtained by
reduction of dioxindolylalanine with sodium borohydride. Compound (B) readily
undergoes decarboxylation to kynurenine in 0.1N acetic acid at 80�, while in
neutral or alkaline solution rapid autoxidation can occur even at room
temperature.
Isolation of ergosterol peroxide from Alternaria dianthicola
Authors: Brown LC , Jacobs JJ
Published: September 2010

A second steroidal
constituent of the Alternaria genus, ergosterol
peroxide, isolated from A. dianthicola, may be an
artefact.
Anharmonicity corrections from Coriolis coupling constants
Authors: Ananthakrishnan TR , Aruldhas G
Published: September 2010

A new method is suggested
for calculating the ratios of harmonic frequencies for certain types of molecules
and their isotopic forms by making use of Coriolis coupling constants. The
method applies to cases where there are two distinct degenerate vibrations with
the same species. The anharmonicity constants for these vibrations can then be
evaluated.
Isolation of s-Butyl β-D-glucopyranoside from Acripeza reticulata
Authors: Cable J , Nocke H
Published: September 2010

s-Butyl β-D-glucopyranoside
has been identified as a major component in the aqueous secretion collected
from the dorsal surface of the abdomen of the tettigoniid,
Acripeza reticulata Guer. The compound has a bitter taste and may fulfil a
defensive role in the insect.
Conformational analysis of coordination compounds. VI. P.M.R. study of diamagnetic five-membered diamine chelate rings
Authors: Hawkins CJ , Peachey RM
Published: September 2010

The proton magnetic resonance spectra of a number of
coba1t(111), molybdenum(0), chromium(0), platinum(11) and palladium(11)
complexes of (R)-propane-1,2-diamine, (S)-3,3-dimethylbutane-1,2- diamine,
(RS)-N,N,N',N?-tetramethylpropane-1,2-dime and ethane-1,2-diamine have been
analysed and the coupling constant data utilized to calculate the
conformational populations for the various complexes. Necessary parameters for
the conformational analysis were obtained from a study of
tetracyano{(S)-3,3-dimethylbutane-1,2-diamine)cobaltate(111),in which the
t-butyl group was assumed to be exclusively in the equatorial orientation. The
preparation and resolution of this t-butyl substituted ethane-1,2-diamine are
described.
Electron-transfer reactions in non-aqueous media. II. Reduction of CoF(NH3)52+, CoCl(NH3)52+ and CoBr(NH3)52+ by iron(II) in dimethyl sulphoxide-water mixtures
Authors: Matthews BA , Watts DW
Published: September 2010

The kinetics of the
reduction of the cobalt(111) octahedral complexes, CoF(NH3)52+,
CoCl(NH3)52+ and CoBr(NH3)52+,
by iron((11) in various Me2SO-H2O mixtures have been
studied over a range of temperatures. The activation parameters obtained for
the chloro and bromo systems are consistent with a change in the
stereochemistry of the iron (11) atom in the bridged intermediate from
octahedral in water to tetrahedral with increasing Me2SO
concentration. The fluoro system, however, has
activation parameters which are less sensitive to solvent composition and
consistent with the iron(11) atom maintaining octahedral coordination.
Electron impact studies. CII. +E spectra from negative ions. Flavones and quinones
Authors: Bowie JH , Blumenthal T
Published: September 2010

+ E spectra derived from
the molecular anions of flavones and quinones are used to illustrate and
compare the resolution and sensitivity of spectra obtained by both magnetic and
electric sector scan techniques. Some fragmentations are noted which do not occur
in the conventional positive-ion spectra of these compounds.
The Hydrolysis of Amides in Acid Solutions - A New Kinetic Equation
Authors: Giffney CJ , O'Connor CJ
Published: September 2010

A new kinetic equation,
based on a reaction mechanism in which water attacks the N-protonated conjugate acid in the
rate-determining step, is formulated for the acid-catalysed hydrolysis of arnides. The equation is well fitted by 60 sets of data for
hydrolysis of both aliphatic and aromatic amides.
Chemistry of pyrrolic compounds. XXXI. Porphyrins of biosynthetic significance between uroporphyrinogen III and coproporphyrinogen III
Authors: Clezy PS , Hai TT , Gupta PC
Published: September 2010

The four heptacarboxylic acid porphyrins
(2b-e) and the four pentacarboxylic acid porphyrins (2f-i) which can be derived by the
decarboxylation of the acetic acid side chains of uroporphyrin
111 have been prepared by ring synthesis and characterized as their methyl
esters.
The hydrazinolysis of heterocyclic compounds. IV. 4-Hydroxy-1,6,7-trimethylpteridine-2(1H)-thione
Authors: Dickinson RG , Jacobsen NW
Published: September 2010

4-Hydroxy-l,6,7-trimethylpteridine-2(1H)-thione
reacts with hydrazine to yield 4-amino-5-hydrazino- 1,2,4-triazole-3-thiol and
2-hydrazino-1,6,7-trimethylpteridin-4(1H)-one
which is subsequently transformed to
2,2'-hydrazobis[l,6,7-trimethylpteridin-4(1H)-one].
Mechanisms are discussed in terms of substituent effects on the pyrimidine
ring.
Exchange reactions in hot atom chemistry. I. Gaseous methyl iodide
Authors: Cattell FCR
Published: September 2010

High organic retentions of
iodine-128 following the 127I(n,γ)128
I reaction in gaseous mixtures of methyl iodide and iodine result from a
heterogeneous exchange reaction. The time-dependent organic retention can be
related quantitatively to the 'age' of the radioactive iodine atoms. There is
no evidence for a significant contribution from hot atom reactions, nor from
the direct homogeneous exchange of iodine atoms with methyl iodide.