Effective use of the “chiral pool” of natural L‐amino acids is achieved by means of the easily accessible derivatives 1. Depending on the reagent, 1 reacts stereoselectively under either chelate or non‐chelate control to give 2 or 3, respectively. Three examples for R = Me: the ratio 2 : 3 is 3 : 97 with PhMgBr, 4 : 96 with allylTi(NEt2)3, and 94 : 6 with CH3TiCl3.

verbruckend angelagert. Die As-I-Abstande zu den p3bzw. k-verbruckenden I-Atomen II und 12 liegen zwischen 306.8 und 334.9 pm. Dariiber hinaus weisen alle As-Atome jeweils drei kurze As-I-Bindungen im Bereich zwischen 257.8 und 273.6 pm auf. Das vor kurzem charakterisierte Anion hat eine vollig andere S t r~k t u r l~~l : An eine zentrale [As4CI ,,J4--Einheit mit cubanartiger Struktur sind vier AsC1,-Molekule sehr locker angelagert.Das gemeinsame Bauprinzip bei [As,I,,]~-und [Sb,I& laBt erwarten, da13 noch andere, ahnlich aufgebaute Iodoarsenat(r~r)-und -antimonat(r~~)-Ionen durch Variation des Kations zu erhalten sind.

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We provide a systematic country and age group comparison of the gender gap in several generic health indicators and more specific morbidity outcomes. Using data from the Survey of Health, Ageing and Retirement (SHARE), we examined the gender gap in the prevalence of poor self-rated health, chronic health conditions, activity limitations, multimorbidity, pain, heart attacks, diabetes, and depression in three age groups (50-64, 65-79, and 80+) based on linear probability models with and without adjustment for covariates. While women were typically disadvantaged regarding poor self-rated health, chronic health conditions, activity limitations, multimorbidity, pain, and depression, men had a higher prevalence of heart attacks and diabetes. However, the gender gap's magnitude and sometimes even its direction varied considerably with some age trends apparent. Regarding some health indicators, the gender gap tended to be higher in Southern and Eastern Europe than in Western and Northern Europe. All in all, the presence of a gender health gap cannot be regarded as a universal finding as the gap tended to widen, narrow or even reverse with age depending on the indicator and country.