Sanin, P. I. published the artcileAntiwear additives of phosphonate type, Application of Diethyltrichloromethylphosphonate, the publication is Neftekhimiya (1974), 14(2), 317-22, database is CAplus.
The effectiveness of esters of phosphonic acids depended on their structure and on the friction regime. The esters containing no Cl had no effect at high and low loads. Those containing CCl3 groups were effective at both high and low loads or only at high and only at low ones. The difference was assumed to be due to different chem. and adsorption activity of the compounds and chem. modification of the friction surface. The effectiveness depended on the concentration of additive (1.5-6 mmole/100 g oil).
Neftekhimiya 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, Application of Diethyltrichloromethylphosphonate.
Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics