摘要:

AbstractA mixing‐reaction model (MIRE) is used to develop criteria, readily accessible by experiment, which permit the chemist to decide whether and when mixing effects influence the product distribution in competitive consecutive or parallel reactions. The validity of these criteria is demonstrated by comparison of prediction and experiment in the examples use

ISSN:0570-0833    

DOI:10.1002/anie.197708073

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractTitanium tetrachloride can accelerate numerous organic reactions. Valuable syntheses of,e.g., allyl sulfides, amides, enamines, and ketones are based upon transformations of functional groups with TiCl4. Particular mention should also be made of carbon‐carbon linkage with TiCl4which permits the synthesis of hydroxy ketones and carbonyl compounds of the Michael adduct type. TiCl4reducedin situis suitable for the reduction of chloroarenes or the linkage of two aldehyde molecules to give an alken

ISSN:0570-0833    

DOI:10.1002/anie.197708171

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThis article describes a new concept of copolymerization which occurs spontaneously without any added catalyst. A nucleophilic monomer (MN) combines with an electrophilic one (ME) to generate a zwitterion[+]MN—M E−, which is responsible for the initiation and propagation of copolymerization. Twenty‐three novel copolymerizations have been explored on the basis of the new concept. MNmonomers which have been investigated are five‐ and six‐membered cyclic imino ethers, dihydro‐2(3H)‐furanimine, an azetidine, a cyclic phosphinic acid ester and a Schiff base; the MEmonomers include β‐propiolactone, a cyclic dicarboxylic acid anhydride, a sultone, acrylic acid, acrylamide, a β‐hydroxyalkyl acrylate and ethylenesulfonamide. In most combinations, alternating 1 : 1 copolymers were produced. In addition to the above‐mentioned combinations, the alternating 1 : 1 copolymerization of cyclic phosphite with α

ISSN:0570-0833    

DOI:10.1002/anie.197708261

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractCyclic azo compounds including heteroaromatics with a NN bond of strong double‐bond character can eliminate molecular nitrogen on addition of sufficient thermal energy or on electronic excitation. Some substrates decompose spontaneously, others are moderately or even extremely resistant to N2‐elimination. From a preparative point of view this type of reaction opens a variety of interesting possibilities,e.g.the synthesis of small carbocycles or heterocycles, strained bi‐ and polycycles, as well as cage compounds. From a theoretical mechanistic viewpoint, current importance attaches to the primary fragments such as carbenes, diradicals, trimethylene, trimethylenemethane, dipoles, ylides, antiaromatic 4π‐systems, unstable cycloalkynes,

ISSN:0570-0833    

DOI:10.1002/anie.197708351

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197708521

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197708531

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197708541

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197708551

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197708572

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197708581

出版商:Hüthig&Wepf Verlag    

年代:1977

数据来源: WILEY