RS Group Research Articles

Nucleophilic replacement of the tert-butylsulfonyl group in the thiophene series. IX

The conditions for dimethylation of tert-butyl-2-thienylsulfone at positions 3 and 5, in 60–70% yield, are determined. In 5-tert-butyl-sulfonylthiophene-2, 4-dialdehyde, the tert-butylsulfonyl group readily undergoes nucleophilic replacement by RS and RO groups. In the case of 3-tert-butylsulfonylthiophene-2, 5-dialdehyde, treatment with nucleophilic reagents does not lead to replacement, and only a hemiacetal is formed from one of the aldehyde groups.

Effects of overtraining on the establishment of mental set in anagram solving

Three groups of 10 Ss each solved a list of 60 anagrams. In a set group (S) the first 45 anagrams were five-letter words rearranged into a 54123 letter-order pattern. In a random-set group (RS) the first 30 anagrams were in several varying letter arrangements followed by 15 anagrams in the 54123 order. A random group (R) received 45 anagrams in varying letter arrangements. The last 15 anagrams for all three groups were arranged in a 32145 order. The median solution times for the S group were significantly faster than those of the RS group in the last 15 trials.

Spectra and structure of 1,2,3-phosphorus-containing heterosubstituted 1,3-Butadienes

1. It has been shown spectroscopically that rotational isomerism at the C-P bond and geometric isomerism at the carbon double bond occur in l-alkylthio-2-oxydichlorophosphine-, 1-alkylthio-2-oxydialkoxyphosphineand l-alkoxy-2-dialkyloxyphosphine-3-chlorobutadienes-l,3. 2. In all of the compounds investigated, there is a conjugated system of double carbon-carbon bonds and the grouping -CC1=CH2. 3. The frequencies of the double bonds are reduced considerably because of the conjugation of the π-bonds, the diene grouping, and the P=O bond in the molcule. The RS group has a stronger effect on the frequency of the multiple bonds than does the RO group.