Patent GB-1490335-A (GB)
Title: Dithiophosphate ester derivatives and lubricating oils containing them
IPC: C10N30/06
Filed: 1973-10-04
Abstract: 1490335 Dithiophosphate ester derivatives and intermediates therefor ETHYL COOPER Ltd 26 Sept 1974 [4 Oct 1973] 46372/73 Headings C2P and C2C [Also in Division C5] The invention comprises compounds of the general formulµ wherein in Formula (I) R is the residue of an intra-molecular sulphur bridged hydrocarbon ring containing 12 carbon atoms and wherein in Formula (II) -[-R 2 -]- n  is a polymer comprising the residue of a plurality of substantially intermolecularly sulphur-bridged hydrocarbon rings each containing 12 carbon atoms, n being the degree of polymerization, each R 1  is the same or different and is an alkyl, alkenyl, aryl, alkaryl or aralkyl group having from 2 to 18 carbon atoms, preferably 3 to 18 carbon atoms, and A is a nucleophilic group. R (or R 2 ) may particularly be derived from 1,5,9-cyclo-dodecatriene, especially the cis-trans-trans form thereof, and the sulphur bridging can be effected by reacting the hydrocarbon with sulphur dichloride or other sulphur chloride to yield a monomeric or polymeric derivative. The group A is preferably -X-P(X)(OR 1 ) 2  wherein X is O or S or may be -XR 3 , XC(X)-R 3  wherein X is O or S and R 3  is alkyl, aryl, alkaryl or aralkyl, or A may be -CN, -NCO or -NCS. The compounds may be obtained by reacting an appropriate dithiophosphoric acid, or a metal or amine salt thereof, (III) with a compound Cl-R-Cl or Cl-[R 2 ] n -Cl in the ratio of 2 moles of III to 1 mole of the dichloro compound to give the bis- (dithiophosphate diester) derivative containing the group R or [R 2 ] n . Alternatively, the reactants may be used in a 1 : 1 mole ratio to leave unreacted chlorine which is then reacted with a metal derivative of the group A or the latter may first be reacted with the dichloro compound in 1 : 1 mole ratio and the product then reacted with (III). Any residual ethylenic bonds may be reacted with sulphur, P 2 S 5 , mercaptans, phenols, thiocyanate ions, carboxylic acids or other compounds reactive with ethylenic bonds; if necessary in the presence of a catalyst. Examples are given for the production of various products in which the group R is the radical of 13 - thiabicyclo[8,2,1]tridec-5-ene, R<SP>1</SP> is a variety of ester-forming groups and A is -SP(S)(OR 1 ) 2 , -NCS, phenoxy, dodecylthio, CN, acetoxy, hexanoxy, and -NCO, respectively, and also for preparing a compound of type II by reacting trans, trans-1,5,9-cyclododecatriene with sulphur dichloride in molar ratio of 1 : 1 to form a polymeric product and then reacting the latter with O,O<SP>1</SP>-ditridecyl dithiophosphoric acid in the presence of triethylamine. The products are useful as additives for lubricants. The starting materials of formula Cl-R-Cl may be obtained by reacting sulphur dichloride with an excess, e.g. 5 mole excess, of the unsaturated ring compound from which R is derived and the compounds Cl[R 2 ] n Cl may be obtained by reacting the unsaturated compound with sulphur dichloride in substantially equimolar proportions. Examples are given for the production of 2,9-dichloro-13-thiabicyclo- [8,2,1]-5-tridecene and for its further reaction with an equimolar proportion of phenol, KCNS, sodium n-dodecyl mercaptide, sodium cyanide, sodium acetate, sodium hexanolate, and KCNO, respectively, to replace one of the chlorine atoms by phenyl, NCS, C 12 H 25 S, CN, CH 3 COO, C 6 H 13 O and NCO respectively. An example is also given in which cis, trans, trans-1,5,9-cyclododecatriene is reacted with an equimolar proportion of sulphur dichloride to yield a polymeric chlorine- and sulphur-containing derivative.