The title compound, (C(10)H(28)N(4))[MnCl(4)(H(2)O)(2)]Cl(2)·2H(2)O, consists of isolated octa-hedral [MnCl(4)(H(2)O)(2)](2-) anions, tetra-protonated 1,4,8,11-tetra-azoniacyclo-tetradecane cations, chloride anions and water mol-ecules connected by a network of hydrogen bonds. The Mn(II) atom is situated on an inversion centre, and the 1,4,8,11-tetra-azoniacyclo-tetradecane cation is located on...

A detailed study on the lithiation-electrophilic trapping of N-sulfonyl ethylene aziridines is described. The optimum results required use of a N-2,4,6-tri-iso-propylbenzenesulfonyl activating group and lithiation using 3 equiv. of s-BuLi-PMDETA for 1 minute before addition of the electrophile. In situ trapping with Me3SiCl was also successful. Electrophilic trapping with aldehydes provided a s...

In order to ascertain the stomatal and photosynthetic responses of mustard to ethylene under varying N availability, photosynthetic characteristics of mustard grown with optimal (80 mg N kg(-1) soil) or low (40 mg N kg(-1) soil) N were studied after the application of an ethylene-releasing compound, ethephon (2-chloroethyl phosphonic acid) at 40 days after sowing (DAS). The availability of N in...

BACKGROUND AND AIMS Despite their toxicity, reactive oxygen species (ROS) play important roles in plant cell signalling pathways, such as mediating responses to stress or infection and in programmed cell death, at lower levels. Although studies have indicated that hydrogen peroxide (H(2)O(2)) promotes seed germination of several plants such as Arabidopsis, barley, wheat, rice and sunflower, the...

Reaction of thiodiacetate anion (tda) with [Cu(TMEDA)(NO3)2] (TMEDA = N,N,N'N'-tetramethyl ethylene-diamine) in a stoichiometric ratio afforded the complex {[Cu(TMEDA)(tda)]·(H2TMEDA)(NO3)2·H2O} (1). When [Cu(TMEDA)(NO3)2] was added in excess, it yielded a μ-oxalato complex {[Cu2(TMEDA)2(μ-ox)(H2O)2](NO3)2·2CH3CN} (2). The reaction involves a facile room temperature desulfurization of the thiod...

Complexes of oxovanadium(lV) with N,N' -ethylene-bis-(2-aminobenzamide) [EBAB], N,N ' -propylene-bis-(2ami nobenzamide) [PBAB], N.N ' -(o-phenylene)-bis-(2-aminobenzamide) [PhBAB] , N,N' -ethylene-bis-(3-carboxypropenamide) [EBCP], N,N' -propylene-bis-(3-carboxypropenamide) [PBCP]and 1-(2'-hydroxyphenyl)-3-phenyl-I ,3-propanedione [HPPPD] have been prepared and characterized by chemical analyse...

The possible involvement of Ca2+ as a second messenger in snapdragon (Antirrhinum majus L.) shoot gravitropism, as well as the role of ethylene in this bending response, were analyzed in terms of stem curvature and gravity-induced asymmetric ethylene production rates, ethylene-related metabolites, and invertase activity across the stem. Application of CaZ+ chelators (ethylenediaminetetraacetic ...

Using cryochemical manipulation of Ni atom reactions with ethylene-argon mixtures at 15-25 K and from examination of the vibrational and electronic spectra, we have identified N i ~ ( c 2 H 4 ) ~ (where rn = 1,2) in the presence of Ni(CZH4), (where m = I , 2, 3). These results suggest strongly that the ethylene moiety is complexed to the chemical site in a r-complexed manner, probably i n assoc...