Synthesis of bi-and tricyclic monoesters of dicarboxylic acids

A thermal addition of aliphatic dicarboxylic acids to bicyclo[2.2.1]-heptene hydrocarbons and to tricyclo[5.2.1.0^2,6]deca-3,8-diene was investigated and new samples of dicarboxylic acids alicyclic monoesters were synthesized. Some of monoesters synthesized have a pleasant fragrance and can find application as fragrance substances. They are also of interest as initial components for preparation of new organic compounds.     

Synthesis of bicyclo[2.2.1]hept-2-yloxyethyl acrylates and saturated acid esters derived from them

New reactive monomers, bicyclo[2.2.1]hept-2-yloxyethyl acrylates, were prepared by esterification of monoethers derived from ethylene glycol and bicyclic alcohols with acrylic acid, using naphthalene-1,5-disulfonic acid as a new effective catalyst. The related propionates and isobutyrates were prepared by hydrogenation of these acrylates.     

Limit distribution function of inhomogeneities in regions with random boundary. I

A study is made of the interaction of systems of charged particles with a membrane consisting of inhomogeneities randomly distributed in accordance with the same law in the neighborhoods of corresponding sites of a planar crystal lattice. A system of equations for the self-consistent potentialU ₁(x, ⁰,..., ^N ,...) and density of surface changes (x, ⁰,..., ^N ,...) is derived and solved.Institute of Nuclear Physics, Uzbek Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 92, No. 1, pp. 98–112, July, 1992.     

Evolution of a quantum system of many particles interacting via the generalized Yukawa potential

We study the evolution of a system of N particles that have identical masses and charges and interact via the generalized Yukawa potential. The system is placed in a bounded region. The evolution of such a system is described by the Bogoliubov–Born–Green–Kirkwood–Yvon (BBGKY) chain of quantum kinetic equations. Using semigroup theory, we prove the existence of a unique solution of the BBGKY chain of quantum kinetic equations with the generalized Yukawa potential.     

Synthesis of halomethyl-substituted bicyclo[2.2.1]hept-2-yl(meth)acrylates

Russian Journal of Applied Chemistry - Bicyclic esters, which are reactive monomers for the synthesis of new polymeric products and also of organic compounds, were synthesized by the reaction of...     

Gerphytine,a new furanoquinoline alkaloid from <Emphasis Type="Italic">Haplophyllum griffithianum</Emphasis>

A series of known alkaloids and the new base gerphytine were isolated from total alkaloids from the aerial part of Haplophyllum griffithianum growing in Surkhandar′ya Oblast, Republic of Uzbekistan. Gerphytin was identified based on spectral data and an x-ray crystal structure analysis as a furanoquinoline derivative and had the structure 7-O-allyl-4,8-dimethoxyfuranoquinoline.     

Observation of sequential excited-to-excited states resonant tunneling in weakly coupled superlattices with wide quantum wells

The sequential excited-to-excited state resonant tunneling effect was observed in weakly coupled long-period superlattices resulting in additional negative differential conductivity resonances in multistable current–voltage characteristics. The results obtained show the evidence of the highly nonequilibrium distribution of carriers over subbands with energies below the optical phonon energy in superlattices. A new type of electric field domains, due to resonant tunneling between excited subbands in adjacent wells, is considered, and experimental evidencies of such a domain's existence are given.     

Limit distribution function of inhomogeneities in regions with random boundary. II

A system of charged particles and inhomogeneities randomly distributed in accordance with the same law in the neighborhoods of corresponding sites of a planar crystal lattice is investigated. The limit distribution function of the inhomogeneities is determined.Institute of Nuclear Physics, Uzbek Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 94, No. 1, pp. 84–97, January, 1993.     

Synthesis of Tricyclic Diesters from 8-Acetoxytricyclodec-3-ene Monoester

Tricyclic diesters were synthesized in yields of 70.4–90.8% by the addition of С₂–С₅ monobasic carboxylic acids to tricyclo[5.2.1.0^2,6]dec-3-еn-8-yl acetate in the presence of a BF₃·OEt₂ catalyst. One of the synthesized diesters, tricyclodec-3,8-diyl diacetate, has a pleasant smell with a citrus scent and can be used in different perfume compositions as a flavoring.     

Extremality of translation-invariant Gibbs measures for the $$\lambda$$ -model on the binary Cayley tree

Theoretical and Mathematical Physics - We consider the $$\lambda$$ -model on the Cayley tree of order $$k=2$$ . Under some conditions, we study translation-invariant Gibbs measures. Moreover, we...