Ragulin, V. V. published the artcileDouble Arbuzov Reaction. Synthesis of Bis(ω-cyanoalkyl)phosphinic Acids, Synthetic Route of 612-13-5, the publication is Russian Journal of General Chemistry (2019), 89(8), 1728-1730, database is CAplus.
A general method for the synthesis of sym. bis(ω-cyanoalkyl)phosphinic acids from ammonium hypophosphite is proposed. The reaction of bis(trimethylsilyl)hypophosphite generated in situ with the ω-bromoalkylnitrile mol. according to the Arbuzov reaction and the subsequent silylation of the hydrophosphoryl intermediate gives bis(trimethylsilyl)phosphonite. The latter reacts with the 2nd ω-haloalkylnitrile mol. by the Arbuzov reaction with the formation of the 2nd P-C bond.
Russian Journal of General Chemistry published new progress about 612-13-5. 612-13-5 belongs to nitriles-buliding-blocks, auxiliary class Organic Pigment, name is 2-(Chloromethyl)benzonitrile, and the molecular formula is C8H6ClN, Synthetic Route of 612-13-5.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts