Cleaving dialkoxy alkane compounds to give aldehydes or ketones is conducted in an ionic liquid medium e.g. 1-ethyl-3-methyl-imidazoliumhydrogen sulfate

摘要

Cleaving dialkoxy alkane compounds (I) to give aldehydes or ketones is conducted in an ionic liquid medium (II). Cleaving dialkoxy alkane compounds of formula R a1C(R b1)(OR 1)OR 2(I) to give aldehydes or ketones is conducted in an ionic liquid medium of formula K +>A ->(II). R a1, R b1H; or optionally substituted saturated or unsaturated aliphatic or aromatic group which may contain one or more heteroatoms, provided that only one of R a1and R b1may be H; or CR a1R b1ring R 1, R 2optionally substituted saturated or unsaturated aliphatic or aromatic group which may contain one or more heteroatoms; or R 1+R 2a ring; A ->(HSO 4) ->, (SO 4) 2->, (NO 3) ->, (BF 4) ->, ((RF)BF 3) ->, ((RF) 2BF 2) ->, ((RF) 3BF) ->, ((RF) 4B) ->, (B(CN) 4) ->, (PO 4) 3->, (HPO 4) 2->, (H 2PO 4) ->, (alkyl-OPO 3) 2->, ((alkyl-O) 2PO 2) ->, (alkyl-PO 3) 2->, (RFPO 3) 2->, ((alkyl) 2PO 2) ->, ((RF) 2PO 2) ->, (RFSO 3) ->, (HOSO 2(CF 2) nSO 2O) ->, (OSO 2(CF 2) nSO 2O) 2->, (alkyl-SO 3) ->, (HOSO 2(CH 2) nSO 2O) ->, (OSO 2(CH 2) nSO 2O) 2->, (alkyl-OSO 3) ->, (alkyl-C(O)O) ->, (HO(O) C(CH 2) nC(O)O) ->, (RFC(O)O) ->, (HO(O)C(CF 2) nC(O)O)-, (O(O)C(CF 2) nC(O)O) 2->, ((RFSO 2) 2N) ->, ((FSO 2) 2N) ->, (((RF) 2P(O)) 2N) ->, ((RFSO 2) 3C) ->, ((FSO 2) 3C) ->, Cl ->or Br ->; n : 1-8; RF : fluorinated alkyl (C mF 2m-x+1H x), fluorinated aryl or alkyl-aryl; m : 1-12; x : 0-7; and K +>ionic liquid of ammonium-, phosphonium-, thiouronium-, guanidinium- or heterocyclic- cation. When m is 1, then x is 0-2.