Cyano compounds mass spectra

Compound 37a showed the absence of an aldehydic proton and the singlet around 8.15 ppm was assigned to the ethylenic proton located p with respect to the electron-withdrawing cyano and ester groups. The benzofuranyl coumarins 38 exhibited the carbonyl-stretching band around 1690 cm in the IR spectra (Table 6). PMR data for 13 compounds are given in Table 2. The El mass spectrum of 36a showed a molecular ion peak at m/z 324 (41%). 

Two aspidofractinine-type compounds, lahadinines A (233) and B (234), obtained from Kopsia pauciflora are remarkable for having a cyano-substituent at C(21) [162]. The mass-spectra of these alkaloids are characterized by a strong molecular ion (usually also the base peak), with the odd mass indicating the presence of a third nitrogen. Fragments attributable to loss of CN and HCN were also detected in the mass-spectrum and the IR spectrum showed a weak band at ca. 2250 cm. The characteristic H(21) signal was absent in the H NMR... 

The loss of 44 5 uma was also observed in the mass spectrum of poly-BFl synthesized by anionic polymerization with PhLi as the initiator (Fig. 39), recorded using the dithranol as matrix. In this case, the difference between the two most intense peaks belonging to each cluster is about 77 Da, suggesting that the most intense peaks correspond to the macromolecular chains terminated with a phenyl group (Ph) at one end, as expected since PhLi was used as initiator [23]. Since very similar mass spectra were recorded using other matrices, such as CHCA (a-cyano-4-hydroxycinnamic acid), DCTB [tra/25-2-[3-(4-t rt-butylphenyl)-2-methyl-2-pro-penylidene]malononitrile], and HABA [2-(4-hydroxylphenylazo)benzoic acid], the question about the loss of a compound with a mass 44 5 requires appropriate investigations by means of post-source decay (PSD) and CID (collision induced dissociation) MALDI-TOF/TOF tandem mass spectrometry methods. 

Cr CNNi(tetren) 6](C104)9 is a red-purple solid, soluble in water-acetonitrile mixtures where the undissociated heptanuclear entity can be identified by electrospray ionization mass spectrometry. IR spectroscopy shows the presence of a unique /cn band at 2146 cm of the bridging cyano ligand and an intense band of the perchlorate anion at cr = 1090 cm The IR spectrum of the C-enriched compound prepared from K3[Cr( CN)6] displays a /cn band at 2103 cm The compound crystallizes in a trigonal system, space group R3, with parameters a = b = 15.274 A and c = 41.549 A. The magnetic properties indicate a ferro-... 

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