Synthesis of Quaternary -Hydroxy Phosphonates via Direct Hydroxylation of Phosphonate Compounds. -Quaternary -hydroxy phosphonates (II) are efficiently synthesized by direct hydroxylation reaction of phosphonates (I) under mild conditions. Molecular oxygen is used as environmentally friendly oxidant and triethyl phosphite as the reductant. -(LIU, J.; WANG, W.; WANG, R.; GU*, L.; Chin. J. Chem. 33 (2015) 5, 559-562, http://dx.doi.org/10.1002/cjoc.201400858 ; Key Lab. Chem. Ethnic Med. Resour., Min. Educ., Yunnan Minzu Univ., Kunming, Yunnan 650500, Peop. Rep. China; Eng.) -R. Langenstrassen 38-195