Myannik, A. O. published the artcileThe effect of composition of some esters of phosphoric and phosphonic acids on their activity as mixtures, in decreasing friction wear, SDS of cas: 866-23-9, the publication is Teoriya Smazochnogo Deistviya i Novye Materialy (1965), 63-7, database is CAplus.
H3PO4 esters were synthesized from dialkylphosphoric acid chlorides and of alcs. Almost all the esters are liquids soluble in hydrocarbons and lubricating oils. The experiment was carried by adding 6 millimoles of ester to 100 g. oil (1.4-2.2%). Wear-load curves were constructed. H3PO4 esters considerably increase the critical load (80 kg.) for pure lubricating oil to 150 kg., after addition of diethyl isoamyl phosphate, and to 227 kg. after addition of diethyl trichloropentyl phosphate. Increasing wear resistance is seen after addition of compounds containing (RO2)P(:S) S < (RO)2P(:S)O < (RO)2P(:O)S < (RO)2P(:O)O groups. The addition of methyl- and trichloromethyl phosphonic acids increases the load to 300 kg.
Teoriya Smazochnogo Deistviya i Novye Materialy published new progress about 866-23-9. 866-23-9 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is Diethyltrichloromethylphosphonate, and the molecular formula is C5H10Cl3O3P, SDS of cas: 866-23-9.
Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics