Table 9.
BHCA values of Lewis base, ordered by increasing BHCA values.
| system | BHCA [kJ/mol] | system | BHCA [kJ/mol] |
| PH3 (343) | +77.8 | NH3 (344) | +84.3 |
| Ph2P–NEt2 (251) | +137.7a |
 (345) |
+148.1b |
| NEt3 (45) | +150.7 | NMe3 (20) | +153.0 |
 (346) |
+157.8b | pyridine (1) | +160.0 |
 (347) |
+164.4b |
 (44) |
+167.8 |
 (14) |
+171.7 |
 (53) |
+184.6 |
 (24) |
+186.4c | P(OPh)3 (252) | +193.0 |
 (348) |
+200.5b |
 (254) |
+207.7 |
| P(OEt)3 (255) | +208.1 |
 (54) |
+213.0b |
| PMe3 (70) | +215.5 |
 (56) |
+221.4b |
| P(iPr)3 (117) | +224.8 |
 (349) |
+225.8b |
| PPhMe2 (256) | +230.1 | PPh(iPr)2 (279) | +230.4 |
| PEt3 (98) | +230.6 | PPh2t-Bu (281) | +232.7 |
 (350) |
+233.3b |
 (57) |
+233.3b |
| PPh3 (89) | +235.0 | PPh2Me (259) | +236.0 |
| PPhEt2 (261) | +237.6 | PPh2Et (264) | +241.1 |
| PPh2c-Pr (267) | +241.9 |
 (294) |
+242.1 |
| PPh2n-Bu (102) | +243.2 | PPhn-Pr2 (269) | +244.0 |
| PPh2n-Pr (270) | +245.8 | Ph2P–NEt2 (251) | +245.8d |
 (276) |
+246.0 | PPhn-Bu2 (280) | +248.0 |
| PPh2c-Bu (278) | +248.3 | PPh2(iPr) (268) | +248.3 |
| Pc-Hex3 (124) | +249.8 | PPh2c-Hex (285) | +250.5 |
 (60) |
+250.6e | PPh2c-Pen (286) | +251.3 |
 (295) |
+252.4 | PPh2c-Hep (289) | +254.5 |
 (298) |
+266.5 |
 (300) |
+306.2 |
aBHCA value on nitrogen; bpyridine nitrogen; cN3; dBHCA value on phosphorus; eN(sp2).