ChemInform Abstract Reaction of the N-silyl lactams (I) with the cyclopropanone (II) gives the O,N-acetals (III) which are cleaved by methanol, producing the hemiaminals (IV).

251ChemInform Abstract Reaction of the title compounds (I) and (II) leads to the formation of the cyclopropanone (III) which is coupled with benzyl alcohol (IV) to yield the adduct (V). (IR-, 1H-NMR-data).

The research is aimed at studying economically valuable traits and genetic control of resistance to leaf-stem diseases, photoperiodic reaction and short stemming of soft spring wheat variety Semenovna, created by scientists of the Omsk Agrarian Scientific Center (Russia) and the North Kazakhstan Agricultural Experimental Station (Kazakhstan). Using methods of state variety testing, molecular genetics and in vitro methods, morphological features of a new variety, features of its development have been described, the yield level at different ecological test points for three years (2015-2017) has been analyzed. The studies conducted at two ecological points made it possible to select a medium-sized promising line of soft spring wheat (Lutescens 354/04-6), which was transferred to the State Registration Service of the Republic of Kazakhstan and after two years of testing was included into the State Register of the Republic of Kazakhstan under the name Semenovna (patent No. 1023). In terms of grain quality, it was at the level of valuable wheat, exceeded the standard in protein content by 1-2 % and raw gluten by 3-4 %. The new medium-ripe Semenovna variety combines increased yield (2.73-4.40 t/ha) with resistance to drought (resistance index Ir = 0.57), brown and stem rust (IU = 0.00-0.23). The genotype of the variety contains wheat-rye translocation 1RS.1BL (with a cluster of Lr26/Sr31/Pm8/Yr9 genes). The medium-stem variety carries the Rht8b allele in its genotype (174 bp)  and is photosensitive to the length of the day (allele 414 bp). The parameters of ecological plasticity of the new variety are determined: linear regression coefficient (bi = 1.08), stability index (σd2 = 0.27).

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260ChemInform Abstract The silyldiazomethanes (III), prepard either by reaction of the silyl triflate (I) with diazomethane (II) or from the phosphoryl azide (IV) and the Grignard reagent (V), is coupled with the ketenes (VI) to give the title compounds (VII) stereoselectively as the Z-isomers. Treatment of (VII) with nucleophilic reagents such as benzyl alcohol (VIII), lithium alanate, or the silyl phosphites (XI) leads to the formation of the derivatives (IX), (X), and (XII). (1H-, 13C-, 29Si-NMR-data, mechanism).