| 摘要 |
<p>Novel title cpds. have formula: (where Y = H and Z = a direct bond between R2 and the B atom or Y and Z together form =CH-; R1 = methyl or phenyl; when Y = H,R2 = H (except when R1 = phenyl), acetyl, carbethoxy, carboxyethyl, carbomethoxy, ethyl, thenoyl, benzoyl, acetoxy-benzoyl or phenacetyl; when Y and Z = CH R2 = thienyl or a hydroxy-methoxy phenyl.</p> |
