Establishing a solid

A simple, efficient and general method for the synthesis of 4H-pyrans is established through a multi component cyclocondensation of aromatic aldehydes, malononitrile and ethyl acetoacetate or acetyl acetone using snail shell as a natural catalyst.

10p tocectocec 26-05-2020 24 2   Download

Human cytochrome P450 3A4 forms a series of minor testosterone hydroxylation products in addition to 6b-hy-droxytestosterone, the major product. One of these, formed at the next highest rate after the 6b-and 2b-hydroxy prod-ucts, was identified as 1b-hydroxytestosterone. This product was characterized from a mixture of testosterone oxidation products using an HPLC-solid phase extraction-cryoprobe NMR/time-of-flight mass spectrometry system, with an estimated total of
6lgof this product.Mass spectrometry established the formula as C19H29O3(MH + 305.2080)....

8p awards 05-04-2013 41 4   Download