Furthermore, in cases where TEBAC and tetradecyltrimethylammonium bromide acted as alkylating agents, N-substituted compounds were obtained by benzyl and methyl groups, respectively, as can be appreciated.
Commercially available TEBAC and tetrade-cyltrimethylammonium bromide are considerably more convenient to handle than alkyl halides, the latter of which are lachrymators and carcinogenic reagents.
To xylene (10.0 mL), TEBAC (1.1 mmol) and a heterocyclic compound (1.0 mmol) were added, followed by a solution of NaOH 50% (5.0 mL).
Using the standard procedure, to xylene (10.0 mL), 0.5003 g of TEBAC (1.1 Eq) and 0.2996 g of methanone (3a) (1.0 Eq) were added, followed by a solution of NaOH 50% (5.0 mL).
In order to investigate the effect of solution surface tension on bead formation, TEBAC was added to the PHBV/(CH[Cl.sub.3] + C[Cl.sub.4]) solution to make the conductivity of this solution equal to that of the PHBV/(CH[Cl.sub.3] + [C.sub.3][H.sub.7]ON) system, while allowing solution surface tension to vary (Table 1).
CH[Cl.sub.3] CH[Cl.sub.3] + [C.sub.2] + [C.sub.3] Solvent compositions CH[Cl.sub.3] [H.sub.5]OH [H.sub.7]ON Surface tension Coefficient (*[10.sup.-3]N/m) 26.10 22.50 30.30 Conductivity ([micro]S/cm) 0.3190 13.50 22.50 Charge density (C/[m.sup.3]) 594.0 2240 3823 Fiber morphologies Exhibiting Smooth Exhibiting Beads of beads of 4.5 10 [micro]m [micro]m CH[Cl.sub.3] CH[Cl.sub.3] + C[Cl.sub.4] Solvent compositions + C[Cl.sub.4] + 1.73% TEBAC Surface tension coefficient (*[10.sup.-3]N/m) 24.70 24.50 Conductivity ([micro]S/cm) 0.01700 22.50 Charge density (C/[m.sup.3]) 225.2 3841 Fiber morphologies Exhibiting beads Smooth of 16 [micro]m Charge density means charge density carried by the moving jet at applied voltage of 20 KV and solution feeding rate of 4 ml/h