Yn. Bubnov et al., SYNTHESIS OF TRIVINYLMETHANE AND TETRAVINYLMETHANE DERIVATIVES USING PENTA-2,4-DIENYL(DIPROPYL)BORANE, Mendeleev communications, (6), 1994, pp. 214-215
Sequential deprotonation, borylation and allylboration reactions, star
ting from penta-1,4-diene, provide a general approach to the synthesis
of branched polyenes and polyenynes, including the tetravinylmethane
derivatives.