Catalyst for hydrogenation of 1,3-cyclobutanediketone compound is provided, which includes a support and VIIIB group transition metal loaded thereon. The support includes a first oxide powder with a surface wrapped by a second oxide. The first oxide includes silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, zinc oxide, or a combination thereof. The second oxide has a composition of M.sub.xAl.sub.(1-x)O.sub.(3-x)/2, M is alkaline earth metal, and x is from 0.3 to 0.7.

Catalyst for hydrogenation of 1,3-cyclobutanediketone compound is provided, which includes a support and VIIIB group transition metal loaded thereon. The support includes a first oxide powder with a surface wrapped by a second oxide. The first oxide includes silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, zinc oxide, or a combination thereof. The second oxide has a composition of M.sub.xAl.sub.(1-x)O.sub.(3-x)/2, M is alkaline earth metal, and x is from 0.3 to 0.7.

A polymer includes a plurality of repeated polymerized units according to scheme (2): ##STR00001##

A polymer includes a plurality of repeated polymerized units according to scheme (2): ##STR00001##

A polymer includes a plurality of repeated polymerized units according to scheme (2):

##STR00001##

A polymer includes a plurality of repeated polymerized units according to scheme (2):

##STR00001##

Catalyst for hydrogenation of 1,3-cyclobutanediketone compound is provided, which includes a support and VIIIB group transition metal loaded thereon. The support includes a first oxide powder with a surface wrapped by a second oxide. The first oxide includes silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, zinc oxide, or a combination thereof. The second oxide has a composition of M.sub.xAl.sub.(1-x)O.sub.(3-x)/2, M is alkaline earth metal, and x is from 0.3 to 0.7.

Catalyst for hydrogenation of 1,3-cyclobutanediketone compound is provided, which includes a support and VIIIB group transition metal loaded thereon. The support includes a first oxide powder with a surface wrapped by a second oxide. The first oxide includes silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, zinc oxide, or a combination thereof. The second oxide has a composition of M.sub.xAl.sub.(1-x)O.sub.(3-x)/2, M is alkaline earth metal, and x is from 0.3 to 0.7.