Alkynylation of chiral aldehydes: Alkoxy-, amino-, and thio-substituted aldehydes

Article Abstract:

A review focuses on the diastereoselective synthesis of propargylic alcohol via alkynylmetallic additions to chiral 2- and 3-alkoxy-, amino- and thio-substituted aldehydes as well as the different combinations of their 2,3,-disubstituted counterparts. Variations of cation, solvent temperature, and protecting-group effects on these reactions are studied, and it is shown that reagent control or use of an external chiral inductor is extremely effective in controlling reaction diastereoselectivity.

Amino compounds, Thiols, Aldehydes, Chemical properties, Alkynes

---

Saving and demographics: some international comparisons

Article Abstract:

The savings rates in the US, West Germany and Japan during the 1980s aree presented. It is shown that West Germany's and Japan's net national savingswere three times and six times larger than the net national savings of the US. Additionally, it is shown that the percentage of US citizens belonging to the high-saving group is lower than that for West Germany and Japan. However, US citizens belonging to the high-saving group are expected to increase by 50% in the year 2010.

Demographic aspects, Savings

---

The all-chemist

Article Abstract:

Chemist Linus Pauling ranks among the world's greatest scientific thinkers, with his idea of electron sharing enabling chemistry to become a distinct discipline in its own right and emerge from the shadow of physics.

Appreciation, Chemists, Pauling, Linus

Similar abstracts:

• Abstracts: Notting Hill up and coming. Geneva: alpine air and international fare. Houses of worship
• Abstracts: Timing and vulnerability in research on malnutrition and cognition. School breakfast and cognition among nutritionally at-risk children in the Peruvian Andes
• Abstracts: Beta-carotene and the carotenoids: beyond the intervention trials. Impact of nutritional deficiencies on resistance to experimental pulmonary tuberculosis
• Abstracts: A half-century perspective on world nutrition and the international nutrition agencies. Nutrition and liver disease
• Abstracts: Lunch among the hydrangeas: spend an afternoon in a sun-dappled cottage garden. Los dias de los muertos

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.