The Woodward–Hoffmann rules summarize the above different reactions.
ð ə WORD_BOUNDARY w ʊ d w ə ɹ d WORD_BOUNDARY h ɑ f m ə n WORD_BOUNDARY ɹ uː l z WORD_BOUNDARY s ʌ m ə ɹ ɹ aɪ z WORD_BOUNDARY ð ɪ WORD_BOUNDARY ə b ʌ v WORD_BOUNDARY d ɪ f ɹ ə n t WORD_BOUNDARY ɹ ɪ æ k ʃ ə n z WORD_BOUNDARY