[moonlove99]

 can anyone help me ?
Pls provide me the mechanism of synthesis cyclohexene to cis-1,2-cyclohexenediol in!!! what is the  chair conformation on this reaction??..thx very much!!

[burnt]

if you meant oxidation of cyclohexene into cis-1,2-cyclohexandiol, take a look at the attached file.
Hope that helps

[moonlove99]

thx a lot ya

[moonlove99]

erm..may i know the discription of that diagram? thx

[burnt]

well it's an oxidation performed with an oxidazing agent OsO4 (osmium tetraoxide)and it is not a diagram but a mechanistic pathway. In a first step it undergoes a cycloaddition (pericyclic reaction that gives the cis-configuration) with the double bond of the starting material, yielding an osmate ester which is subsequently cleaved under aqueous conditions to give the desired cis-diol.