The crystal structure of the title phosphonium salt
consists of a tetrahedral (C6Hs)P +C(C4HS)-
(COOCH2CH3) cation and a Br- anion. The triphenylphosphonium
group has P---C(phenyl)
distances which are equal within experimental error
[mean 1.802 (9),~] and is attached directly to an
endocyclic tertiary C atom with a larger P--C distance
of 1.857 (8) ,~. The tetrahedral CmP--C
angles range from 104.9 (4) to 114.4 (4) ° . The carbonyl
O atom of the ethoxycarbonyl group is located
on the opposite side of the positively charged P
atom.