โ Scribed by H. Kogler; R. Lattrell; W. Schubert; M. Weber
No coin nor oath required. For personal study only.
The cyclohe.xenop_vridinio cephafosporin 1 ICefqinomeI reacts in the presence of a base irreversibly to the spiro compound 3. The structure has been elucidated by twodimensional NMR-experiments. The energy of the possible stereoisomers of _3 has been calculated by MhDO.
๐ SIMILAR VOLUMES
I-Arylprop-2-ynyl aryl ethers (6) undergo a facile Claisen rearrangement in N,N-diethylaniline/o-dichlorobenzene to give flav-3-enes in good yields. Though the aryl propargyl ether Claisen rearrangement has been recognised as one of the simple routes for the synthesis of 2H-I-benzopyrans' there are
## Abstract Boron trifluorideโcatalyzed rearrangement of methyl 10,11โepoxyundecanoate in the solvent dioxan resulting in the formation of a cyclic acetal, methyl 11,11โethylenedioxyundecanoate is described.
## Abstract A novel way of preparing ^11^C labelled methyl esters using [^11^C]methanol and either BF~3~ etherate or trimethylsilyl chloride as catalyst was investigated. Radiochemical yields with BF~3~ etherate were between 30 and 33% for [^11^C]methyl benzoate and less than 1% for [^11^C]methyl t
Pyrrole-2-aldehyde undergoes condensation with methyl ketones in aqueous ethanolic alkali in a 2:1 mole ratio yielding 6-acyl-5-(2-pyrrolyl)-3H-pyrrolizines as novel products in moderate yield.