Pentaerythritol tetrabromide

In other cases warming is required to complete reaction. In this process, as well as when distilling the crude bromide from the reaction mixture, the temperature must be raised slowly so as to avoid formation of phosphorus hydrides which may inflame spontaneously. In the preparation of pentaerythritol tetrabromide, C(CH2Br)4, from pentaerythritol and PBr3 as described in Organic Syntheses935 the reaction is completed by heating in an oil-bath at 170-180° for 20 h. 

Tetrakis[(diphenylphosphino)methyl]methane has been similarly prepared from pentaerythritol tetrabromide.217 The more reactive potassium diphenyl-phosphide permits the preparation also of ditertiary aromatic phosphines.218... 

The second group of 02 + 4 polycondensations was conducted with electrophilic monomers When pentaerythritol tetrabromide was reacted with tert.-... 

Benzenesuffonyl esters. That 0S02C Hs is an effective leaving group is illustrated by a procedure for the conversion of pentaerythritol to pentaerythrityl tetrabromide."... 

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