Main bridge

The rules for identifying the main ring, the main bridge and the secondary bridges and for numbering the structure are complex (see lUPAC Blue Book Rules A-31 and A-32 B-79MI10200)) and not always easy to apply this probably accounts for the appearance of many incorrect von Baeyer names in the literature. 

Rhodium(II) forms a dimeric complex with a lantern structure composed of four bridging hgands and two axial binding sites. Traditionally rhodium catalysts faU into three main categories the carboxylates, the perfluorinated carboxylates, and the carboxamides. Of these, the two main bridging frameworks are the carboxylate 10 and carboxamide 11 structures. Despite the similarity in the bridging moiety, the reactivity of the perfluorinated carboxylates is demonstrably different from that of the alkyl or even aryl carboxylates. Sohd-phase crystal structures usually have the axial positions of the catalyst occupied by an electron donor, such as an alcohol, ether, amine, or sulfoxide. By far the most widely used rhodium] 11) catalyst is rhodium(II) acetate [Rh2(OAc)4], but almost every variety of rhodium] 11) catalyst is commercially available. 

The main ring and the main bridge form a bicyclic system whose numbering is made in compliance with Rule A-31. 

A wider range of cyclizations occurred to conjugated ester dipolarophiles. Thus, (221) underwent thermolysis to the corresponding carbonyl ylide, which cyclized to give mainly bridged cycloadduct.122 The homologous oxirane with a five-carbon chain was also studied and gave only the transfused product (222) in 73% yield at 55% conversion. 

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In most cases, three-wire RTDs are used in the industry, so these will be considered here. Mainly, bridge circuits using a modified Wheatstone bridge are used. In these circuits, measured output voltage is a function of the RTD resistance. Requirements for RTDs are similar to thermocouples. Use of a double-channel AC barrier with parameters discussed later will be a cost-effective solution. 

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