Patent ID: 8288605

Claim:
A process for preparing Î²-carotene of the Chemical Formula 2, which comprises the steps of: (a-3) deprotonating cyclic geranyl sulfone (N), and then reacting with the C 20 dialdehyde of the Chemical Formula 3 to synthesize the C 40 diol compound (O); (b-3) applying functional group transformation reactions to the above C 40 diol compound (O) to produce the corresponding dihalide or diether compound (P); and finally (c-3) reacting the above protected diol compound (P) with a base to induce the double elimination reactions of the sulfone and the halogen or the ether functional groups, thereby producing the conjugated polyene chain, wherein, in the formulas, Ar and Arâ€² independently represent the groups of C 6 -C 30 substituted or unsubstituted aryl, or C 2 -C 30 substituted or unsubstituted heteroaryl; X represents the groups of halogen atom or C 1 -C 20 substituted or unsubstituted alkoxy.