Chlorinated procedure for

HCB (Fig. 2) was used mainly as fungicide in wood and seed treatment, but it is also a by-product of several chlorination procedures for the production of organochlo-rine solvents, plastics and in the secondary aluminium industry (Fig. 3). A total... 

Likewise, the luminescence properties of many analytes can be altered in the presenoe of surfactant aggregates (4,7.,8.). Consequently, addition of micelle-forming surfactants (present either in the LC mobile phase or added post-column) can improve the sensitivity of fluorimetric LC detectors (49,482). Micellar spray reagents have been utilized to enhance the fluorescence densitometric detection of dansylamino acids or polycyclic aromatic hydrocarbons (483). The effect was observed for TLC performed on cellulose or polyamide stationary phases with the micellar spray reagent being either CTAC, SB-12, or NaC (483). More recently, use of nonionic Triton X-100 has been found to improve the HPLC detection of morphine by fluorescence determination after post-column derivatization (486) as well as improve the N-chlorination procedure for the detection of amines, amides, and related compounds on thin-layer chromatograms (488). 

The halogen-metal exchange reaction of diethyl 1,1-dichloroalkylphosphonates with n-BuLi provides a convenient preparation of diethyl 1-lithio-l-chloroalkyIphosphonates in a yield somewhat higher than those obtained by the chlorination procedure.For example, trapping of diethyl 1-lithio-l-chloroethylphosphonate with aliphatic or aromatic aldehydes and aliphatic ketones provides a suitable route to diethyl 1-methyl-1,2-epoxyalky Iphosphonates in good yields (61-81%, Scheme 4.3) as a mixture of (Z)- and ( )-isomers in approximately equal amounts. ... 

Two special chlorination procedures for pentachlorocorannulene and decachloro-corannulene open new avenues for the study of this area (see below). Already mentioned above, 1,2,5,6-tetrabromocorannulene (18) is a formal precursor of corannulene when using the Rabideau closure, but it is of direct importance for making various corannulene derivatives. The importance of multi-halocorannulenes stems from the variety and reliability of nucleophilic aromatic substitutions and related transition-metal catalyzed couplings with nucleophiles. 

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See also in sourсe #XX -- [ ]

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