Recent developments in the chemistry of low-coordinated phosphaalkenes were reviewed in terms of preparation, coordination chemistry and applications in catalytic organic synthesis.

Pd/C is the catalyst in the preparation from 1, 2-propadienyl-phosphonic acid to cis-1-propenyl phosphonic acid.

The obtained results indi- cate that the ring-opening reaction of 2H-azaphosphirene complex to phosphinidene is the rate-controlling one, which needs to overcome 84.

Study on inspection method of butenyl-phosphate residue in meat goods;

Two new azaphosphene compounds are prepared by the reaction of lithium 2,4,6 tri t butylphenylnitride with the corresponding phosphonous dichloride,followed by the dehydrochlorination reaction with 1,8 diazabicyclo[5.

Their changes in 31 P NMR chemical shift compared with diphosphene compounds are analyzed.

The reaction of m - chloroperbenzoic acid with some pentacarbonyltungsten complexes of (E) - diphosphene having the O-P= P skeleton afforded a new type of complexes of phosphorus esters.