Patent ID: 7652171

Claim:
A process for the cleavage of dialkoxyalkanes of to give aldehydes or ketones, comprising cleaving a compound of formula I: where R a and R b , independently of one another, denote an optionally substituted aliphatic or aromatic radical, which may have one or more heteroatoms, where one of the radicals R a or R b may also denote H, and where the two radicals R a and R b may be connected to one another, and where R 1 and R 2 , independently of one another, denote an optionally substituted saturated or unsaturated aliphatic or aromatic radical, which may have one or more heteroatoms, and where the two radicals R 1 and R 2 may be connected to one another, in the presence of at least one ionic liquid of the general formula K + A − , wherein anion A− of the ionic liquid is [HSO 4 ]—, [SO 4 ] 2− , [NO 3 ]—, [BF 4 ]—, [(R F )BF 3 ]—, [(R F ) 2 BF 2 ]—, [(R F ) 3 BF]—, [(R F ) 4 B]—, [B(CN) 4 ]—, [PO 4 ] 3− , [HPO 4 ] 2− , [H 2 PO 4 ]—, [alkyl-OPO 3 ] 2− , [(alkyl-O) 2 PO 2 ]—, [alkyl-PO 3 ] 2− , [R F PO 3 ] 2− , [(alkyl) 2 PO 2 ]—, [(R F ) 2 PO 2 ]—, [R F SO 3 ]—, [HOSO 2 (CF 2 ) n SO 2 O]—, [OSO 2 (CF 2 ) n SO 2 O] 2− , [alkyl-SO 3 ]—, [HOSO 2 (CH 2 ) n SO 2 O]—, [OSO 2 (CH 2 ) n SO 2 O] 2− , [alkyl-OSO 3 ]—, [alkyl-C(O)O]—, [HO(O)C(CH 2 ) n C(O)O]—, [R F C(O)O]—, [HO(O)C(CF 2 ) n C(O)O]—, [O(O)C(CF 2 ) n C(O)O] 2− , [(R F SO 2 ) 2 N]—, [(FSO 2 ) 2 N]—, [((R F ) 2 P(O)) 2 N]—, [(R F SO 2 ) 3 C]—, [(FSO 2 ) 3 C]—, Cl— and/or Br—, where n=1 to 8, and R F is fluorinated alkyl of the formula (C m F 2m−x+1 H x ) where m=1-12 and x=0-7, where, for m=1, x must be 0 to 2, and/or fluorinated aryl or alkylaryl.