Asymmetric Synthesis of L-2-Amino[3-11C]butyric Acid, L-[3-11C]Norvaline and L-[3-11C]Valine.

3 + L L

Synthesis of 3-Methyl-3=butenyl=l=pyrophosphate*

In an earlier communication (1) and in Paper I of this series (2) a 5 carbon intermediate in the biosynthesis of squalene from mevalonic acid has been described and identified as a-methyl3-butenyl-1-pyrophosphate (isopentenylpyrosphosphate). The compound has now been synthesized chemically both in unlabeled and in tritium-labeled form and it is shown to have properties identical with those of t...

Bounds for GL ( 3 ) × GL ( 2 ) L - functions and GL ( 3 ) L - functions

In this paper, we will give the subconvexity bounds for self-dual GL(3) L-functions in the t aspect as well as subconvexity bounds for self-dual GL(3) × GL(2) L-functions in the GL(2) spectral aspect.

3-O-Ethyl-l-ascorbic acid

In the crystal structure of the title compound, C(8)H(12)O(6), mol-ecules are linked to each other by O-H⋯O hydrogen bonding.

Synthesis of C14-Labeled L-Sorbose and L-Ascorbic Acid

A m ethod is prese nted for preparing C'4-l abeled L-ascorbi c acid (vi tamin C) from labeled banum D-gluconate or D-glucose. The process is adapted from t he commercial synthesis of vi tamin C t hrough sorbitol, L-sorbose and potassium di-O-isopropylidene-2kelo-L-guloll.ate. In .th e cyanohydrin . synt hesis of labeled D-glucose, barium D-gluconate is used as an lI1term ed~at~ . Fo: prepanng l...