Synthesis of Di- and trialkylazulenes

The synthesis of 2-isopropyl-1,3-dimethyl, 1-isopropyl-2,3-dimethyl, 1-isopropyl-2-methyl and 5-isopropyl-6,8-dimethylazulenes are described.     

Synthesis of Di- and Triterpenoid Ferrocenyltriazoles

Ferrocene conjugates with a lupane triterpenoid linked through a triazole ring and C₃ or C₆ hydrocarbon tether were synthesized by reaction of ferrocenylalkylazides with betulonic acid propargyl ester. Analogous conjugates were obtained from dehydroabietic acid propargyl ester.     

Synthesis and properties of blocked Di- and polyisocyanates

Tricresol-blocked di- and polyisocyanates (BDPs) of variable structure are synthesized, and their main physicochemical and technological properties are defined. They have lower melting points and thermal dissociation (deblocking) temperatures than do the known BDPs based on ε-caprolactam, oximes, and secondary amines.. The new blocked isocyanates are tested as latent curing agents for polyurethane varnish compositions of electroinsulating assignment.     

顺丁烯二酸二异辛酯的合成

以顺丁烯二酸酐和异辛酯为原料，用对甲苯磺酸作催化剂合成顺丁烯二酸二异辛酯。用正交试验确定了酯化反应的优化条件，酯化率达97．96％．     

A Simple Propellane Synthesis

A dianion-mediated dialkylation reaction provides ready access to a heterocyclic propellane. The methodology should provide a general entry into a variety of similar systems.     

Lanthanide-Catalyzed Synthesis of Cyclic Silicon-Containing Di- and Triperoxides

Russian Journal of Organic Chemistry - An efficient method has been developed for the synthesis of di(tri)peroxysilacycloalkanes by cyclization of geminal bis-hydroperoxides and...     

Synthesis of some Di- and tetra-acetyle nic amines

Conclusions Arylbutadiynes and bis-butadiynyl-arenes react vigorously with paraformaldehyde and secondary amines under mild conditions in the presence of cuprous chloride, forming the corresponding polyacetylenic amines in high yields.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1272–1275, July, 1966.     

A Simple Synthesis of Oxaphospholes

Abstract

Stable derivatives of oxaphospholes were obtained from the reaction between electron-deficient acetylenic compounds and phenacyl bromide or its derivatives in the presence of triphenylphosphine in acetonitrile as the solvent in excellent yields.

GRAPHICAL ABSTRACT     

A Simple Synthesis of Oximes

Summary. The conversion of alicyclic and aliphatic carbonyl compounds as well as aromatic aldehydes into the corresponding oximes (up to quantitative yields) was achieved by simply grinding these reactants, hydroxylamine hydrochloride and sodium hydroxide without solvent. However, this procedure was unsuccessful in the case of aromatic ketones. In this case it was necessary to add silica gel as a catalyst.     

A Simple Synthesis of dl—Shikonin

A new facile route for the synthesis of dl-shikomin is presented.Reformatsky reaction assisted cross-coupling of 1,4,5,8-tertramethoxynaphthalene-2-carbaldehyde and ethyl-bromoacetate was empolyed for introduction of the side chain of dl-shikonin.     

Synthesis of Modified Di- and Trisaccharide Fragments of N-Glycoproteins

Abstract

The syntheses of several analogues of disaccharide Manot(1→6)Mana-OCH₃ (1) and of trisaccharide Mana(1→6)[Mana(1→3)]Mana-OCH₃ (2) are reported. The syntheses are described of the diastereomeric 6-methyl derivatives 9a and 9b, which are representatives of fixed conformations of disaccharide 1. The syntheses of the 2-amino-2-deoxy analogues 15 and 17 and the synthesis of the 2-fluoro-2-deoxy analogue 28 are also reported.     

A Simple and Convenient Synthesis of Pyrazinones

Pyrazinones were synthesized by reacting mesoionic azlactone [2‐aryl‐4‐methyl‐Δ²‐oxaxolin‐5‐one] and 1,4‐diazabutadienes in good yields at room temperature.     

A Simple Synthesis of New Phosphaalkenes

Abstract

Upon treatment of phosphanylsubstituted phosphorus ylides like la-c with two equivalents BF₃ *OEt₂ the compounds 2a-d are obtained almost quantitatively. In them a phosphonium-and a phosphenium ion compete for the electron density at the bridgeing carbon atom. A X-ray analysis of 2a and the reactivity of transient 3a,b so far studied reveal the olefinic character corresponding to phosphonium substituted phosphaalkenes.     

A Simple Synthesis of 1-Methylcyclobutene

Controlled thermal decomposition of the sodium salt of cyclopropyl methyl ketone tosylhydrazone gives 1-methylcyclobutene of excellent purity in good yield.