Arsane production

Tangible evidence was found for the in situ production of perfluoro(2,3,4,5-tetrahydro-pyridines) 2, 3, and 4 during the transfer of F- from perfluoro-l-fluoropiperidine (1) to carbanionic sources.22 23 Perfluoro-l-fluoropiperidine (1) was employed to convert triphenyl-phosphane, -arsane, and -stilbane to the difluorides, triphenylphosphorus difluoride, triphenyl-arsenic difluoride, and triphenylantimony difluoride, respectively,24 and sodium phenoxide to 2- and 4-fluorophenol.25 Perfluoro-l-fluoropiperidine (1) reacts with 7V,/V-dimethylaniline, substituting the 0/7/m-hydrogen by fluorine. A similar reaction proceeds with /V,/V-diethylaniline.26... 

Hochachka et al., 1973 Driedzic and Hochachka, 1975). By now, many workers have identified the pathways by which the products of protein catabolism are utilized, both in normal environments and also during pollution (Johnston, 1975, 1983 Walker and Johansen, 1977 Hughes and Johnston, 1978 van den Thillart and Kesbeke, 1978 Waarde, 1983 Driedzic et al., 1985 Grubinko, 1991 Kurant and Arsan, 1991 Konovets et al., 1994 Grubinko and Arsan, 1995). The pool of free amino acids is therefore an important source of energy during hypoxia. 

Oxygen uptake is not very useful in studies of energy expenditure, since 30-40% of it is not used for phosphorylated oxidation or ATP resynthesis, but for other varieties of oxidation such as peroxic and enzymatic oxidation which results in the production of heat (Khaskin, 1981). In any case, the efficiency of oxygen uptake as measured from the PIO coefficient varies according to various eco-physiological factors (Verzhbinskaya, 1968 Arsan et al., 1984 Savina, 1992). The heat produced is dissipated into the environment, except in the case of certain very active fish that possess a heat-exchange mechanism (Stevens et al., 1974) permitting the body temperature to rise and thereby increase muscle power (Love, 1980, p.321). 

Reaction of VI with neopentylmagnesium bromide yields a product of molecular weight, as found by mass spectroscopy, corresponding to V (R = CH2CMe3). However, this compound exhibits all the properties of the tertiary arsane X (R = C CMes) (94). 

As in the case of cyanophosphanes (Section III,A,8), isomerization of the nitriles to the isonitriles is the initial step. While triisocyanatoarsane proved to be inert to HFA (176), the expected product 81b with triisothiocyanato-arsane has been isolated (240). The structure of 81b is reported. 

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