Phosphabenzene compounds of the formula (I) ##STR1## where the radicals R.sup.1 to R.sup.13 are, independently of one another, hydrogen, COOM, SO.sub.3 M, NR.sub.3 X, NR.sub.2, OR, COOR or SR (where M=hydrogen, NH.sub.4 or alkali metal, X=anion, R=hydrogen or C.sub.1 -C.sub.6 -alkyl), or C.sub.1 -C.sub.12 -alkyl, C.sub.6 -C.sub.12 -aryl, C.sub.7 -C.sub.12 -aralkyl, C.sub.7 -C.sub.12 -alkaryl or C.sub.3 -C.sub.6 -heteroaromatics, where the alkyl, aryl, alkaryl and aralkyl radicals may bear the abovementioned radicals as substituents and two or more of the radicals may be joined to form aliphatic or fused-on rings, where at least one of the radicals R.sup.4 and R.sup.8 and at least one of the radicals R.sup.9 and R.sup.13 is not hydrogen, can be used for preparing hydroformylation catalysts.

Compostos de Phosphabenzene do ## do ## STR1 da fórmula (I) onde os radicais R.sup.1 a R.sup.13 são, independentemente de um outro, hidrogênio, COOM, SO.sub.3 M, NR.sub.3 X, NR.sub.2, OU, de COOR ou de SR (onde M=hydrogen, NH.sub.4 ou alcalino, X=anion, R=hydrogen ou C.sub.1 - C.sub.6 - alkyl), ou C.sub.1 - C.sub.12 - alkyl, C.sub.6 - C.sub.12 - arilo, C.sub.7 - C.sub.12 - aralkyl, C.sub.7 - C.sub.12 - alkaryl ou C.sub.3 - C.sub.6 - o heteroaromatics, onde os radicais do alkyl, do arilo, do alkaryl e do aralkyl podem carregar os radicais acima mencionados como substituents e dois ou mais dos radicais podem ser juntados ao formulário aliphatic ou fund- nos anéis, onde ao menos um dos radicais R.sup.4 e R.sup.8 e ao menos um dos radicais R.sup.9 e R.sup.13 não é hidrogênio, pode ser usado preparando catalizadores do hydroformylation.

 
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