def extract_key_value_pairs(data):
    """
    Extracts key-value pairs from a list of tuples.

    Args:
        data (list): List of tuples containing key-value pairs.

    Returns:
        dict: Dictionary with extracted key-value pairs.
    """
    return {item[0]: item for item in data}

data = [('v5_1768236144', 108217.11959687909, 721, 15009.3), 
        ('v5_1768235312', 89435.63603047856, 734, 12184.7),
        ('v5_1768235983', 98379.19963352643, 987, 9967.5)]

result = extract_key_value_pairs(data)
print(result)