Patent ID: 7915457

Claim:
A process for the preparation of a compound of the formula B comprising: providing a compound of the formula A reacting the compound of the formula A in an intramolecular reaction in the presence of an aluminium siloxide of the formula (Ia) or (Ib) wherein R 1 , R 2 , R 3 in each case independently of one another are hydrogen or methyl, R 4 is hydrogen or an alkyl radical having 1 to 6 C atoms, n is 0, 1 or 2; and R a′ , R a″ , R a′″ in each case independently of one another and, for formula (Ib), independently of the meaning in a second substituent —SiR a′ R a″ R a′″ are hydrogen or an organic radical, with the proviso that at least one of the radicals R a′ , R a″ , R a′″ of each substituent —SiR a′ R a″ R a′″ is not hydrogen; and independently of one another two or three of the radicals R a′ , R a″ , R a′″ of each substituent —SiR a′ R a″ R a′″ may be covalently bonded to one another; and X in each case independently is an organic or inorganic substituent, but not hydrogen or a siloxy group having a substituent —SiR a′ R a″ R a′″ as defined above.