To get notified if a specific product has been purchased, use the send_email_notification attribute.
STEPS:
Go to WP Admin > Woocommerce > Products, and edit the specific product.
Inside the Product edit page, scroll down to the Product Data metabox and click on the "Attributes" tab.Â
If the send_email_notification attribute is not yet present on this page, add a new Custom product attribute with the following name: send_email_notification
Under Values, add the e-mail address to notify everytime this product is purchased. (If multiple emails, separate with a comma)
If the send_email_notification attribute is already present on this page, add the e-mail address you wish to notify everytime this product is purchased under the "Values" field of this product attribute. (Separate multiple email addresses with a comma.)
Click on the Save attributes button.