In experimental research, the S-L-E of three groups of isomers was determined by using differential scanning calorimetry , and more than two hundred reliable data were obtained. The isomers include meta-, ortho-, and paradichlorobenzene, meta-, ortho-, and para-dibromobenzene and meta-, ortho-, and para-nitro-benzoic acid.

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It is shown that mixed tolyl arsonic acid was much superior to either para- or ortho-isomer alone for cassiterite flotation.

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The results show high selectivity when the temperature is controlled at 50 CC , and the nitrated reaction time is 90 mm, toluene is nitrated by using 95% nitric acid as nitrating reagent at the presence of acetic anhydride, 1.0g silicotungstic acid catalyst is calcinated at 300℃ for 1.5h. The o/p (ratio of ortho to paro isomer of toluene nitration) ratio is 0.89 in product distribution of toluene nitration, lower than 1.67 using sulfonitric acid as catalyst. The yield of products is 91.6%.

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ORTHO ANISIDINE：鄰氨基苯甲醚

ortho-aminobenzoic acid 鄰氨基苯甲酸 | ortho-anisidine 鄰氨基苯甲醚 | ortho-Chlorobenzoic acid 鄰氯苯甲酸

orthoboric acid：原硼酸

ortho-acid原酸 | orthoboric acid<原>硼酸 | ortho-para directing group鄰對位定向基團

ortho-aminoanisole diazonium salt：鄰氨基苯甲醚重氮鹽

ortho-aluminic acid ==> 原鋁酸 | ortho-aminoanisole diazonium salt ==> 鄰氨基苯甲醚重氮鹽 | ortho-aminobenzenesulfonic acid ==> 鄰氨基苯磺酸