Free aldopentoses and aldohexoses reacted respectively with (EtO) 2P(O)CHNaCOAr to give the five stereospecific free hydroxyl \%β\% C glycosides in one step. The reaction take place under a mild condition. The procedures are simple and convenient. The prices of starting materials are cheap. The method can be applied universally for aldopentoses and aldohexoses. The application scope of Wittig Horner reaction has also been expanded. The synthesis of free hydroxyl \%β\% C glycosides from free aldoses directly using Witting\|Horner reaction has not been reported so far.
