Word Count : 135

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The hydroboration of propene begins with the electrophilic addition of BH₃ to the electron-rich double bond. According to the concept of orbital interactions, the empty p-orbital of ________ __________ _____ ______ __________ _____ ___.
_______ ________ _______ ______ _____ _________ ________.
___ ______ ________ _____ __________ __________ __________ ___ __________ _____ __________.
_______ ________ _________ ____ __________ __________ ________ _____ _________.
_______ ___ ____ ____ ______ ________ _________.
______ ________ ________ ________ _____ _______ _____ _________ _____ _______ _____.
________ ______ __________ _______ ____ _________ _________ ______ _________ _________ ____.
____ ____ ________ ___ _____ ______ ________.
____ ________ _____ ____ ______ ___ _____ _________ _____ ________ _________ ____.
____ _____ _____ ________ _______ _________ __________ ____.
____ ________ _______ _________ ___ _______ ________ _______ _______ ______ ________.
___ __________ ________ ______ ________ _______ ____.
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