bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reactivity of a phosphoranyl radical generated by photoreaction of phenyl diphenylphosphinite with 10‐methylacridinium iodide. α‐Scission vs. single electron transfer
Authors: Yasui Shinro , Shioji Kosei , Ohno Atsuyoshi 
Published: January 2005

AbstractPhotoreaction of phenyl diphenylphosphinite (1b) with 10‐methylacridinium iodide (2) in aqueous acetonitrile under an argon atmosphere gives 10‐methylacridan, the reduction product from 2, in a quantitative yield and phenyl diphenylphosphinate, the oxidation product from 1b, in a low yield, as well as a large amount of diphenylphosphinic acid and a moderate amount of phenol. The product distribution observed here is interpreted well in terms of decomposition of a phosphoranyl intermediate through both α‐scission and single electron transfer (SET) pathways.
Study on the aromaticity and reactivity of chlorophosphinines
Authors: Nyulászi László , Keglevich György 
Published: January 2005

AbstractAromaticity of phosphinine derivatives, such as 2‐, 3‐, and 4‐chlorophosphinines and 4‐chloro‐3‐methyl‐and 3,5‐dimethylphosphinine, has been investigated by means of quantum‐chemical calculations and photoelectron spectroscopy. The position of the π‐bands in the photoelectron spectra of 4‐chloro‐3‐methyl‐ and 3,5‐dimethylphosphinine indicated that the aromaticity of these species is similar to that of the corresponding benzene derivatives.The MP2/6‐31G* and the HF/3‐21G(*) geometries of the chlorophosphinines, together with the isodesmic reaction energies and Mulliken charge distributions, showed that the electronic system of phosphinine is not significantly perturbed by the chloro‐substitution.3‐methyl‐4‐chlorophosphinine, similarly to 2‐chlorophosphinine, was inert toward nucleophiles even under forced conditions. This unreactivity can more likely be rationalized by kinetic considerations than by thermodynamic arguments (such as increased aromatic stabilization of the chlorophosphinines).
Reactions of fused dihydro‐1,2,4‐thiadiazoles with isocyanates and isothiocyanates to give 6aλ4‐thia‐1,3,4,6‐tetraazapentalene derivatives
Authors: Lai Long‐Li , Reid David H. , Nicol Robin H. , Rhodes Jane B. 
Published: January 2005

Abstract3‐Methyl‐6,7‐dihydro‐5H‐1,2,4‐thiadiazolo[4,5‐a]pyrimidine 4a reacted with isocyanates and isothiocyanates with elimination of acetonitrile and concomitant addition of two molecules of the heterocumulene to give the 2,3‐disubstituted‐6,7‐dihydro‐5H‐2aλ4‐thia‐2, 3, 4a, 7a‐tetraazacyclopent[cd]indene‐1 (2H), 4(3H)‐diones 8a–8e and the corresponding dithiones 9a–9h, respectively. 3‐Methyl‐5, 10‐dihydrobenzo[e]‐1,2,4‐thiadiazolo[4,5‐a][1,3]diazepine 5a likewise reacted with isocyanates and isothiocyanates to give the 2,3‐disubstituted‐5,10‐dihydro‐2aλ4‐thia‐2,3, 4a, 10a‐tetraazapentaleno[3, 3a, 4‐gh]benzocyclopheptene‐1, 4‐diones 10a–10f and the corresponding dithiones 11a–11f. The base 4a reacted with phenyl isocyanate, methyl isothiocyanate, and phenyl isothiocyanate in toluene at room temperature to give the zwitterions 14a, 14b, and 14c, respectively, and the diazepine 5a reacted with phenyl isothiocyanate to give the zwitterion 17.
Prior ligand exchange, followed by ligand coupling in the reaction of 2‐pyridyl 2‐thienyl sulfoxide with 2‐thienyllithium or 2‐selenophenyllithium
Authors: Oae Shigeru , Inubushi Yoichi , Yoshihara Masakuni 
Published: January 2005

Abstract2‐Pyridyl 2‐thienyl sulfoxide was found to react with variously substituted 2‐thienyllithiums and 2‐selenophenyllithium, exclusively affording 2‐(2‐pyridyl)thiophenes and 2‐(2‐pyridyl)‐selenophene and the disulfides derived from the substituted thiophenes and selenophene. Apparently, ligand exchange precedes ligand coupling. The coupling product always involved the pyridine nucleus, but no bithienyl‐type products were formed.
Selective side‐chain oxidation of peralkylated pyrrometheneBF2 complexes
Authors: Sathyamoorthi Govindarao , Wolford Lionel T. , Haag Anthony M. , Boyer Joseph H. 
Published: January 2005

AbstractTreatment with 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) oxidized 2,6‐diethyl‐1,3,5,7,8‐pentamethylpyrromethene–BF2 complex 1, 13,14‐trimethyl‐2, 3, 4, 5,9,10,11,12‐octahydroindomethene–BF2 complex 5, and 1,3,5,7,8‐pentamethyl‐1,2,3,5,6,7‐hexahydropyromethene–BF2 complex 8 to the weakly fluorescent 3‐formyl, 5‐oxo, and 8‐formyl derivatives 4, 6, and 9, respectively. The dye 1 was oxidized by lead tetraacetate to 1,7,8‐trimethyl‐2,6‐diethyl‐3,5‐diacetoxymethylpyrromethene–BF2 complex 12 [λf (ethanol) 538 nm, Φ 0.62, λlas (ethanol) 555–570 nm]. Catalytic reduction (Pd/C) converted the aldehyde 4 to 2,6‐diethyl‐3‐hydroxymethyl‐1,5,7,8‐tetramethylpyrromethene–BF2 complex 10 [λf (ethanol) 537 nm, Φ 0.70, λlas (ethanol) 547–575 nm].
The addition of carbonyl compounds to tetramesitylgermasilene and dimesitylgermylene
Authors: Baines Kim M. , Cooke Jeffrey A. , Vittal Jagadese J. 
Published: January 2005

AbstractHexamesitylsiladigermirane, 1, has been photolyzed/thermolyzed in the presence of three representative carbonyl compounds: acetone, pivalaldehyde, and benzaldehyde. In each case, a [2 + 2] adduct between the carbonyl compound and Mes2Ge = SiMes2 was formed regioselectively to give a 2,3‐silagermaoxetane. The 2,3‐silagermaoxetanes have been fully characterized by IR and NMR (1H, 13C, and 29Si) spectroscopy and mass spectrometry. In two cases, the structures have been confirmed by X‐ray crystallography: 4,4‐dimethyl‐2,2,3,3‐tetramesityl‐2,3‐silagermaoxetane, 2a; crystals are triclinic, space group P1 with Z = 2 in a unit cell of dimensions a = 12.318(3) Å, b = 12.436(2) Å, c = 11.884(2) Å, α = 100.13(1)°, β = 103.80(2)°, and γ = 89.97(2)°. The structure was solved by direct methods and refined by least squares on the basis of 2955 observed reflections to R1 and wR2 values of 0.0600 and 0.1363, respectively. The structure of 4‐tert‐butyl‐2,2,3,3‐tetramesityl‐2,3‐silagermaoxetane, 2b, was also determined; crystals are monoclinic, space group Cc with Z = 4 in a unit cell of dimensions a = 11.306(2) Å, b = 21.292(4) Å, c = 16.524(2) Å, and β = 106.83(1)°. The structure was determined by direct methods and refined by full‐matrix least squares on the basis of 1817 observed reflections to R1 and wR2 values of 0.0621 and 0.1681, respectively. An adduct between dimesitylgermylene and the carbonyl compound was also isolated in each reaction. The structure of the adduct appears to depend upon the steric bulk of the group attached to the carbonyl carbon.
Phenyllead(IV) diorganophosphinodithioates, PhnPb(S2PR2)4−n. Synthesis, spectroscopic characterization, and NMR study of the redistribution/decomposition of diphenyllead(IV) derivatives
Authors: Silvestru Cristian , Silvestru Anca , Haiduc Ionel , Ramírez Rubén Gaviño , Cea‐Olivares Raymundo 
Published: January 2005

AbstractTri‐ and diphenyllead(IV) diorganophosphinodithioates, PhnPb(S2PR2)4−n (n = 2 and 3; R = Me, Et, Ph) were prepared by reacting the corresponding organolead(IV) chloride with the sodium or ammonium salt of the phosphinodithioic acid. The title compounds were investigated by infrared, 1H and 31P NMR, and mass spectroscopy, and possible structures were proposed. The diphenyllead(IV) phosphinodithioates, Ph2Pb(S2PR2)2, undergo decomposition on standing or on moderate heating, the least stable being the ethyl derivative. The process was monitored by using 1H and 31P NMR spectroscopy, and a reaction pathway leading to Ph3PbS2PR2, Pb(S2PR2)2, and R2P(S)SPh was established.
Stereoselective formation of (2‐thenyl)‐substituted alkenes from 2‐chloromethylthiophene and lithium trialkylalkynylborates
Authors: Chen Yan , Deng Min‐Zhi 
Published: January 2005

AbstractThe reactions of 2‐chloromethylthiophene (an analog of a benzyl halide) with lithium trialkylalkynylborates gave, after protonation, E‐alkenes with a (2‐thenyl) substituent in good yields, and the reaction stereo‐selectivity was different from that of the reaction of benzyl bromide with an alkynylborate.
Sulfenylation of α‐phosphoryl sulfides. Chemical evidence for intermediate formation of α‐phosphoryl trithioorthoformate [1]
Authors: Bałczewski Piotr , Mikołajczyk Marian 
Published: January 2005

Abstract1‐Lithio‐1‐(diethoxyphosphoryl)methyl methyl sulfide 1‐Li was reacted with diphenyl disulfide in a tetrahydrofuran solution to give predominantly diethyl methylthio(phenylthio)methylphosphonate 2 accompanied by a small amount of diethyl bis‐(phenylthio)methyl phosphonate 3. The latter was the main product when the reaction was performed in the absence of the solvent. The formation of 3 was explained through the desulfenylation of the transiently formed diethyl methylthiobis(phenylthio)methylphosphonate 4 with lithium benzenethiolate and confirmed by 31P NMR measurements at low temperature.
Synthesis and properties of novel amino acid linked phosphoryl nitrogen mustard derivatives
Authors: Chen Ru‐Yu , Wang Hui‐Lin , Zhou Jia 
Published: January 2005

AbstractIn order to look for novel antitumor drugs and virucides with high activity and low toxicity, a series of amino acid linked phosphoryl nitrogen mustard derivatives have been synthesized. The structures of all compounds prepared were confirmed by 1H NMR, 31P NMR, IR, MS spectroscopy, and elemental analyses. In the case of dl‐α‐amino acid derivatives, the presence of multiple chiral centers in the target products leads to the generation of diastereoisomers, which can be detected by spectroscopic and analytical (TLC) methods. Preliminary bioassays indicate that some of compounds 5 have high inhibitory activities against some tumor cells and tobacco mosaic virus (TMV). In addition, some of them display certain herbicidal activities and significant fungicidal activities against wheat leaf rust.
Geometry and conformation of crystalline forms of β‐naphthoxy‐substituted 2‐thio‐1,3,2‐oxathiaphospholanes and 2‐thio‐1,3,2‐dithiaphospholanes
Authors: Błaszczyk Jarosław , Wieczorek Michał W. , Okruszek Andrzej , Olesiak Magdalena , Karwowski Bolesław 
Published: January 2005

AbstractThree compounds (1, 2, and 3) containing 1,3,2‐oxathiaphospholane and 1,3,2‐dithiaphospholane rings were subjected to structural studies by the X‐ray method. Compounds 1 and 3 attain a half‐chair conformation, whereas, for compound 2, an envelope conformation of the five‐membered heterocyclic ring was found in the solid state. For all three compounds, a site occupation of some structural elements in a unit cell was observed.
Synthesis and assignment of absolute configuration of enantiomeric dicyclohexylammonium 2‐oxo‐2‐thioxo‐1,3,2‐oxathiaphospholanes
Authors: Krzyżanowska Bożenna , Stec Wojciech J. , Wieczorek Michał W. , Błaszczyk Jarosław 
Published: January 2005

AbstractThe title compound 2 has been synthesized and its structure has been determined by X‐ray analysis. The following crystal data were found: monoclinic, P21, a = 9.936(4), b = 18.009(3), c = 10.418(3) Å, and β = 107.22(3)°. Two molecules of the compound (two oxathiaphospholane anions and two dicyclohexylammonium cations) are present in the independent part of the unit cell. The absolute configuration at the phosphorus atom is established as Rp. The ionic character of 2 is discussed. In the crystal lattice of 2, a hydrogen‐bonding system occurs.
Low‐temperature 1H, 13C, 77Se, and 125Te NMR studies on the apical‐apical ligand exchange via the hypervalent tellurium and selenium ate complexes [10‐M‐3(C3); M = Se, Te] in the reactions of diaryl tellurides and selenides with aryllithium reagents
Authors: Masutomi Yutaka , Furukawa Naomichi , Erata Tomoki 
Published: January 2005

AbstractPentafluorophenyl phenyl telluride (1) and 3,5‐dichloro‐2,4,6‐trifluorophenyl phenyl telluride (2) react with pentafluorophenyllithium or 3,5‐dichloro‐2,4,6‐trifluorophenyllithium in THF at low temperatures to form the corresponding tellurium ate complexes (A) and (B) as sole intermediates in the ligand exchange on the hypervalent tellurium atom. The corresponding selenides (3) and (4) also react with identical aryllithium reagents in THF to form the discrete intermediates, selenium ate complexes (C) and (D), in the exchange reactions. In these ligand exchange reactions of tellurides and selenides, electron‐withdrawing ligands occupy the apical positions and the exchange takes place between these apical‐oriented groups. The low‐temperature 1H, 13C, 77Se, and 125Te NMR spectroscopic techniques are effective methods for detection of unstable tellurium and selenium ate complexes.
Synthesis and reactions of diphosphenes carrying bulky aryl and phenoxy groups
Authors: An De‐Lie , Toyota Kozo , Yasunami Masafumi , Yoshifuji Masaaki 
Published: January 2005

AbstractUnsymmetrical diphosphenes carrying bulky aryl and phenoxy groups were prepared by the reaction of lithium 2,4,6‐tri‐t‐butylphenylphosphide with the corresponding phenyl phosphorodichloridites, followed by the dehydrochlorination reaction with 1,8‐diazabicyclo[5.4.0]undec‐7‐ene. The diphosphenes were isolated as stable compounds. The reactions of these diphosphenes with elemental sulfur or selenium afforded the corresponding thiadiphosphiranes or selenadiphosphiranes, respectively. The diphosphenes also reacted with dichlorocarbene to give dichlorodiphosphiranes.
Formation and X‐ray structure of a silver iodide based polymeric complex (Ag5l6)n(Ph3PCH2l)n
Authors: Jin Xianglin , Tang Kaluo , Liu Weidong , Tang Youqi 
Published: January 2005

AbstractCompounds [(Ph3P)2AgS2CSR (R = But, TIPT(2,4,6‐triisopropylthiophenolato))], formed by inserting CS2 into the Ag–S bond in AgSR in the presence of PPh3, react with CH2I2 to give pale yellow crystals of (Ag5I6)n(Ph3PCH2I)n, which consist of the polymeric anion (Ag5I6)n− and the cation (Ph3PCH2)+. The polyanion (Ag5I6)n− is composed of alternate I5‐pentagons and Ag5‐pentagons that are connected by Ag–I bonds along the C axis to form a layered “pagoda” structure, in which there exists an unusual stereochemistry of iodine. Crystal data: monoclinic, space group P21/c, a = 15.004(12) Å, b = 27.19(2) Å, c = 7.898 Å, β = 97.18(5)°, V = 3205(4) Å3, Z = 4, R = 0.0673 for 2726 observed reflections.
Synthesis of C‐nucleosides via coupling of ribosyl fluoride with typical aromatic heterocycles bearing a TMS group
Authors: Yokoyama Masataka , Nomura Mitsuru , Tanabe Takeshi , Togo Hideo 
Published: January 2005

AbstractThe direct coupling reaction of D‐ribosyl fluoride with typical π‐excessive aromatic heterocycles such as furan, thiophene, pyrrole, benzofuran, benzothiophene, and indole and their trimethylsilyl derivatives was performed in the presence of boron trifluoride to afford the corresponding C‐nucleosides in moderate to good yields.
Generation of metal phosphinites by the reaction of Se‐alkyl phosphinoselenoates with organometallics and its application to the synthesis of optically active organophosphorus compounds
Authors: Kawashima Takayuki , Iwanaga Hiroki , Okazaki Renji 
Published: January 2005

AbstractReaction of Se‐Alkyl phosphinoselenoates with organometallics resulted in a selective attack on the selenium atom. Sequential treatment of optically active Se‐benzyl t‐butylphenylphosphinoselenoate with PhLi and then with electrophiles, such as alkyl halides, an α,β‐unsaturated ester, and chalcogen atoms gave optically active phosphorus compounds in 5–91% yields and in high optical yields, with retention of configuration at the phosphorus atom, along with a quantitative yield of benzyl phenyl selenide.
2‐Cyanoacrylates as reagents in heteroatomic synthesis (a review)
Authors: Gololobov Yuri G. , Krylova Tatiana O. 
Published: January 2005

AbstractSeveral types of addition reactions to the CC bond of alkyl 2‐cyanoacrylates, CH2C(CN)COOR (1), are considered. The first examples deal with addition of CH‐Acids (pKa less than 13) and of H2S in the presence of catalytic amounts of strong amines, also of mercaptans, thiocarboxylic, and thiophosphoric acids. P‐Sulfenylchlorides and acidic phosphites add irreversibly at 20°C to form addition products in accordance with the distribution of charges in 1. HCl reversibly adds to 1 and to the acid chloride CH2C(CN)COCl (2). Alcohols and H2O also add reversibly to the acid CH2C(CN)COOH (3) and to esters of 1 to transform 1 and 3 into polymers. Triethylsilane in the presence of CF3COOH (4) reduces the CC bond of 1 and 3 to the corresponding saturated derivatives.The second set of examples involves reactions of 1 with P‐III compounds in the presence or absence of 4. Ph3P as well as other weak nucleophiles reversibly add to 1 in the absence of 4 to cause instant polymerization. However, 4 protonates an initially formed zwitter‐ion in the reaction of 1 with Ph3P,(EtO)2PCl,Ph2PCl and thiourea to afford stable addition products. IR spectroscopy reveals the formation of H‐complexes of 4 with the CN and COOR groups of 1, which stimulates the addition of the weak nucleophile (o‐C6H4O2)PCl to the CC bond of 1. This reagent does not react with 1 in the absence of 4. Strong nucleophiles, Alk3P, and (Et2N)3P in excess irreversibly add at 20°C to 1 to form zwitterions, which specifically react with PhNCO to give stable products. 1,3,2‐Dioxaphospholes react with 1 either to form spirophosphoranes or 2‐cyano‐3‐phosphoranylpropionates.
Hypervalent tetracoordinate organobismuth compounds (10‐Bi‐4)
Authors: Chen Xiang , Yamamoto Yohsuke , Akiba Kin‐Ya 
Published: January 2005

AbstractA stable hypervalent 10‐Bi‐4 species, tetraethylammonium bis[α,α‐bis(trifluoromethyl)benzenemethanolato(2‐)‐C2],Obismuthanate(1‐), was prepared by the reaction of bismuth trichloride with 2 equiv of lithium 2‐(2‐lithiophenyl)‐2‐propoxide derivatives. The ate complex was inert toward MeI, instead, the corresponding nonfluorinated analogue, bis[α,α‐bis(dimethyl)benzenemethanolato(2‐)‐C2, O]bismuthanate(1‐), was reactive enough toward MeI to give O‐methylated product. Regioselective methylation at the nonfluorinated methanolate was observed in the reaction of unsymmetrically substituted ate complex, [α,α‐bis(dimethyl)benzenemethanolato(2‐)‐C2, O[]α,α‐bis(trifluoromethyl) benzenemethanolato(2‐)‐C2, O]bis‐muthanate(1‐). Mechanism of isomerization of these ate complexes and related protonated compounds and the synthesis and stability of [α,α‐bis(trifluoromethyl)‐benzenemethanolato (2‐) ‐C2, O]diarylbismuthanate‐(1‐) were also described.
Tricoordinated phosphorus‐containing macrocycles: New synthetic strategies
Authors: Prévoté Delphine , Galliot Christophe , Caminade Anne‐Marie , Majoral Jean Pierre 
Published: January 2005

AbstractPhosphorus dialdehydes RP (OC6H4CHO)2 (R = Ph, Me2N) react with phosphodihydrazides PhP(Y)‐[N(CH3)NH2]2 (Y = S, O) to give macrocycles 6a–c arising from [2 + 2] cyclocondensation reactions. Treatment of phosphodihydrazone PhP(S) [OC6H4CHN–N(Me)H]2 7 with phenyldichlorophosphine affords macrocycle 8 possessing tri and tetracoordinated phosphorus atoms. Clean desulfurization of thiophosphorus macrocycles 9 and 12 gives rise selectively to new tricoordinated phosphorus containing macrocycles 11 and 13.
Synthesis of onio‐, dionio‐, and trionio‐substituted phosphines; the nucleophilic behavior of DBN and DBU toward main group electrophiles
Authors: Bouhadir Ghenwa , Reed Robert W. , Réau Régis , Bertrand Guy 
Published: January 2005

Abstract1,5‐Diazabicyclo[4.3.0]non‐5‐ene (DBN) and 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) react with chloro‐ and dichloro‐phosphines leading to onio‐ and dionio‐substituted phosphines. Similarly, onio‐substituted silicon and tin derivatives are prepared; they are used as onio‐substituent transfer reagents in the synthesis of a trionio‐substituted phosphine.
Novel synthesis of 2,6‐benzothiazonine derivatives
Authors: Kim Sung Hoon , Kim Kyongtae 
Published: January 2005

AbstractThe reaction of 1‐alkylamino‐1‐alkylthio‐3‐phenyl‐3‐thioxopropenes with phthaloyl chloride in toluene at 60°C, followed by treatment with triethylamine, afforded 6‐alkyl‐3‐phenyl‐2,6‐benzothiazonine‐1,5,7‐triones in good to excellent yields.
17O and 11B NMR spectroscopic study of substituted benzo[d]‐2,2‐difluoro‐1,3,2‐oxoniaoxaboratins
Authors: Boykin David W. , Kumar Arvind , Chandrasekaran Subramanian 
Published: January 2005

Abstract17O NMR data are reported for 10 benzo[d]‐2,2‐difluoro‐1,3,2‐oxoniaoxaboratins derived from various ortho‐hydroxyacetophenones and for 2,2‐difluoro‐1,3,2‐oxoniaoxaboratins derived from related hydroxyacetyl naphthalenes and hydroxybenzophenones. The signal for the carbonyl‐like oxygen for these compounds is substantially shielded and appears at 288 ± 22 δ. The single bonded oxygen signal for the 1,3,2‐oxoniaoxaboratins appears at 122 ± 6 δ, except for the naphthalene analogs, whose signal appears at 146 ± 10 δ. The 11B NMR signal for these compounds is insensitive to structural changes and appears at 0.85 ± 0.25 δ. © 1995 John Wiley & Sons, Inc.
Phosphorylated imidazo[1,2‐a]pyridines
Authors: Tolmachev Andrew A. , Yurchenko Alexander A. , Kozlov Ernest S. , Merkulov Anatoliy S. , Semenova Marina G. , Pinchuk Aleksander M. 
Published: January 2005

AbstractThe reaction of phosphorus(III) halides with imidazo[1,2‐a]pyridines in the presence of bases leads to the formation of 3‐phosphorylated imidazo[1,2‐a]pyridines. The reaction proceeds in high yield and requires no catalysts.In the compounds obtained, in contrast to phosphorylated indolizines, the phosphorus–heterocycle bond is stable and not cleaved by dry hydrogen chloride, alcohols, or water.Imidazo[1,2‐a]pyridines with the phosphinic and phosphinous groups can be alkylated both at the phosphorus and at the nitrogen atom of the heterocycle, the alkylation direction being dependent on the strength of the alkylation reagent used. © 1995 John Wiley & Sons, Inc.
Preparation, crystal and molecular structure, and evaluation of plant growth regulating activity of guanidinoalkanephosphinates and phosphonates
Authors: Mucha Arthur , Tyka Roman , Kafarski Pawel , Glowiak Tadeusz , Goplañska Anna 
Published: January 2005

AbstractA series of previously unknown α‐guanidinoalkanephosphonous, α‐ and β‐guanidinoalkanephosphonic acids has been prepared in order to study their structures and biological activity. Aminoalkanephosphonous and phosphonic acids have been converted into their guanidino derivatives by means of S‐methylisothiourea hydroiodide or cyanamide amidination. The crystal and molecular structures of three guanidino acids have been determined by single‐crystal X‐ray diffraction. The plant growth regulating activity of all synthesized guanidinoalkanephosphinates and phosphonates has been evaluated on Lepidium sativum. © 1995 John Wiley & Sons, Inc.
C‐Phosphorylated pyrazoles. Reaction of N‐methyl‐ and N‐phenylpyrazoles with phosphorus(III) halides
Authors: Tolmachev Andrew A. , Sviridon Anzhelika I. , Kostyuk Alexander N. , Pinchuk Alexander M. 
Published: January 2005

AbstractThe reactions of N‐methyl‐ and N‐phenylpyrazole derivatives with phosphorus(III) halides have been studied. The preparative method for synthesis of a variety of 4‐phosphorylated pyrazoles, including pyrazolyl substituted halo‐ and dihalophosphines, has been elaborated. Migration of an alkyl group from O to P(III) in 4‐phosphorylated 5‐alkoxypyrazoles was found to give a P‐ylides in a vinylogous manner with respect to the Arbuzov reaction. © 1995 John Wiley & Sons, Inc.
Methoxymethylsilylene: (1 + 6)‐ and (1 + 4)‐cycloadditions to heterotrienes
Authors: Heinicke Joachim W. , Gehrhus Barbara 
Published: January 2005

AbstractCo‐pyrolytic gas phase reactions of 1,2‐dimethyl‐1,1,2,2‐tetra‐(methoxy)disilane with conjugated 1‐oxatrienes in a flow‐reactor furnish, via intermediate methoxymethylsilylene, mixtures of diastereoisomers of 3‐phenyl‐1‐oxa‐2‐silacyclohepta‐4,6‐dienes and 3‐styryl‐1‐oxa‐2‐silacyclopent‐4‐enes, usually including smaller amounts of the corresponding 1‐oxa‐2‐silacy‐clopent‐3‐ene isomers. In co‐pyrolysis with an analogous N‐isopropylazatriene, five‐membered rings were formed preferentially, and seven‐membered isomers could not be detected by NMR spectroscopy. © 1995 John Wiley & Sons, Inc.