申请人:BASF SE
公开号:US20130172596A1
公开(公告)日:2013-07-04
The present invention relates to a process for preparing 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin (I)
which comprises reacting 2,2′-dihydroxybiphenyl with PCl
3
in the presence of a catalytic amount of an acid salt of a nitrogen base, wherein the reaction is carried out in the absence of external organic solvents.